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.

During which stage of an insect's life cycle does the female lay eggs?  
 (A) nymph (B) larva (C) pupa (D) adult
D

Amylase is a chemical that decomposes starch into maltose and dextrin. Which best describes the role of amylase in the human body?  
 (A) as an inhibitor of insulin production (B) as an enzyme that aids in digestion (C) as a catalyst for protein synthesis (D) as a receptor of fatty acid chains
B

High-altitude cirrus clouds are primarily formed from which substance?  
 (A) carbon dioxide gas (B) solid ice crystals (C) nitrogen compounds (D) ozone molecules

B