The correct answer is option B, that is, temperature optimum.
Explanation:
Every organism demonstrates maximum growth and survival under some values of abiotic elements. The temperature, which encourages maximum development and growth of a specific organism signifies its temperature optimum.
In the mentioned question, the lizard has opted for certain places where the temperature is most appropriate to it. The selection of the specific place to attain the best possible temperature conditions signifies its temperature optimum.
Circulatory system.....circulates blood (a vital delivery system of oxygen) throughout the whole body when tissues need it the most and with a constant supply.
