You are given a science question (hard-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.

Q: How is a moth's life cycle most different from an insect that goes through incomplete metamorphosis?  
 (A) It creates a cocoon. (B) It becomes an adult. (C) It lays eggs. (D) It eats leaves.

A: A
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Q: Jeremy walked at an average rate of speed of 3 kilometers per hour (km/h). How far had Jeremy walked in 30 minutes?  
 (A) 0.1 km (B) 1.5 km (C) 10 km (D) 90 km

A: B
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Q: Which is a chemical change?  
 (A) Element 1 is hammered into a thin sheet. (B) Element 2 is heated and turns into a liquid. (C) Element 3 turns a greenish color as it sits in air. (D) Element 4 is ground up into a fine, slippery powder.

A:
C
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