Answer:

Explanation:
The correct answer to the question is option B: Group of cells. Here's a detailed explanation of why tissue is a group of cells:
1. Tissue definition: Tissue refers to a group or collection of similar cells that work together to perform a specific function in the body.
2. Cell definition: A cell is the basic structural and functional unit of all living organisms. It is the smallest unit of life and can carry out various functions necessary for the survival and functioning of an organism.
3. Tissue composition: Tissues are composed of a group of cells that are similar in structure and function. These cells are organized and work together to perform a specific task or function in the body.
4. Types of tissues: There are four main types of tissues in the human body: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. Each type of tissue is composed of specific cells that have specialized functions.
5. Functions of tissues: Tissues play a vital role in maintaining the structure and function of organs and systems in the body. They provide support, protection, and coordination of various activities.
In conclusion, tissue is a group of cells that work together to perform a specific function in the body. It is an essential component of the human body and is responsible for the proper functioning of organs and systems.