Correct answer is B because, as you know, lamarck in his theory talked only about the inheritance of the acquired characters from the parents to progeny. He told that, giraffes has acquired the long neck from the ancestors in which the long neck was not present at the time of birth, but aquired during their course of development.

Lamarck's theory of organic evolution: Inheritance of acquired characters

Introduction:
Lamarck's theory of organic evolution, proposed by French biologist Jean-Baptiste Lamarck in the early 19th century, was one of the first attempts to explain how species change over time. This theory is also known as the Inheritance of acquired characters.

Key points of Lamarck's theory:
Lamarck's theory of organic evolution is based on several key principles:

1. Use and disuse: Lamarck suggested that individuals can acquire new characteristics or traits during their lifetime through the use or disuse of certain organs or body parts. For example, he proposed that the long neck of a giraffe evolved because ancestral giraffes had to stretch their necks to reach leaves high up in trees.

2. Inheritance of acquired characters: According to Lamarck, these acquired traits can be passed on to offspring. He believed that an individual's traits developed during its lifetime would be inherited by its offspring, leading to evolutionary change over generations.

3. Progressive complexity: Lamarck proposed that there is an inherent drive for organisms to become more complex and advanced over time. He suggested that simple organisms could evolve into more complex forms through a process of gradual transformation.

Influence and criticisms:
Lamarck's theory of organic evolution was influential in shaping early ideas about evolution. However, it faced significant criticism and was eventually replaced by Charles Darwin's theory of natural selection. Some of the main criticisms of Lamarck's theory include:

1. Lack of evidence: Lamarck's theory lacked substantial evidence to support the inheritance of acquired characters. It was mainly based on observations and hypothetical examples rather than rigorous scientific experimentation.

2. Disproven by modern genetics: The discovery of genetics and the understanding of DNA have shown that acquired traits during an individual's lifetime cannot be directly passed on to offspring. Genetic information is not altered by an individual's experiences or use of certain body parts.

3. Does not explain adaptation: Lamarck's theory does not adequately explain how organisms become adapted to their environment. It does not account for the role of natural selection in driving evolutionary change based on variations already present in a population.

Conclusion:
Lamarck's theory of organic evolution, also known as the Inheritance of acquired characters, proposed that acquired traits during an individual's lifetime can be passed on to offspring, leading to evolutionary change. However, this theory has been largely discredited due to the lack of evidence and its inconsistency with modern understanding of genetics and natural selection.