You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[EX Q]: Which two processes occur during the life spans of all animals?  
 (A) hibernation and migration (B) growth and development (C) changing color and shedding fur (D) building nests and communication
[EX A]: B

[EX Q]: Two workers are using a scaffold. One worker weighs 180 lbs. and the other weighs 200 lbs. Impact effects are assumed to increase the live load of the workers' weight by 25 percent. What is the resultant maximum live load, in pounds, that can be expected from the two workers supported by the scaffold?  
 (A) 380 lbs. (B) 475 lbs. (C) 625 lbs. (D) 950 lbs.
[EX A]: B

[EX Q]: Which part of Earth's structure exists in the solid phase due to low temperatures?  
 (A) the inner core (B) the outer core (C) the lithosphere (D) the asthenosphere
[EX A]:
C