Final answer:
Adipose tissue is the connective tissue responsible for storing energy, insulating the body, and protecting organs.
Step-by-step explanation:
The connective tissue that provides reserve food fuel, insulates against heat loss, and supports and protects organs is adipose tissue (B). Adipose tissue consists of cells called adipocytes that store fat in the form of triglycerides, which can be used for energy metabolism. This type of tissue has minimal extracellular matrix and a few fibers but is crucial in maintaining body temperature and cushioning body organs.