Concept:Basking in Agama lizards is a behaviour for body temperature regulation, not for colour change, territorial fights, or courtship.
Explanation:Agama lizards are cold-blooded (ectothermic) animals.
Their body temperature depends on heat from the environment.
By basking in the sun, they absorb heat to raise their body temperature.
A higher body temperature makes their muscles and metabolism active enough for hunting, moving, and other activities.
Courtship or territorial behaviour may happen later, but basking itself is mainly for warming up.
Answer:B. raise their body temperature to become active.