Explanation:

Sexual reproduction is a process in which genetic material from two parents combines to form offspring. This process leads to more variations in the offspring compared to asexual reproduction, where offspring are genetically identical to the parent. The correct answer to this question is option 'B', which states that the genetic material comes from two parents of some species. This is the main reason why sexual reproduction results in more variations in the offspring.

Genetic Material from Two Parents:
In sexual reproduction, the offspring inherit genetic material from both the male and female parent. Each parent contributes half of their genetic material, which contains genes responsible for various traits. This combination of genetic material from two parents results in new combinations of genes in the offspring, leading to variations.

Recombination of Genes:
During sexual reproduction, the genetic material from both parents undergoes a process called recombination. This is when the chromosomes from each parent pair up and exchange segments of DNA. This exchange of genetic material leads to the shuffling and mixing of genes, creating new combinations that were not present in either parent. As a result, the offspring inherit a unique set of genes, contributing to their individual characteristics and variations.

Independent Assortment:
Another factor that contributes to variations in sexual reproduction is independent assortment. During the formation of gametes (sperm and egg cells), the chromosomes segregate randomly. This means that each gamete receives a random assortment of chromosomes from the parent. As a result, the offspring inherit a unique combination of chromosomes, further increasing the genetic variations.

Mutation:
Although not directly related to sexual reproduction, mutations also play a role in generating genetic variations. Mutations are spontaneous changes in the DNA sequence and can occur in any organism. These mutations can be inherited by the offspring through sexual reproduction, contributing to additional variations.

Overall, sexual reproduction leads to more variations in offspring because it involves the combination and recombination of genetic material from two parents. This process introduces new gene combinations and increases genetic diversity, ultimately resulting in a wide range of phenotypic variations among the offspring.