The answer is "a. Heredity does not affect flexibility".
Heredity influences flexibility since flexibility is mostly controlled by some hereditary factors, for example, the length of your femur. Longer femurs result in an expanded scope of movement in the lower body. It is a polygenic attribute thus relationship between any quality variations and adaptability will be frail. Adaptability is additionally influenced by natural factors, for example, the level of physical action of the individual. This implies adaptability if an intricate quality impacted by numerous qualities and the earth.