instruction:
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.
question:
Which of the following is a step in the life cycle of an apple tree?  
 (A) Eggs grow from seedlings. (B) Fruit forms flowers. (C) Seedlings grow from leaves. (D) Fertilized flowers form fruit.
answer:
D


question:
A student plants rosebushes in her front yard. The student is frequently seen pulling weeds from the base of the rosebushes. What is the most likely reason that the weeds are pulled?  
 (A) Weeds add fertilizer to the soil. (B) Weeds use nutrients the roses need to grow. (C) Weeds increase the bacteria in the soil. (D) Weeds consume most of the oxygen.
answer:
B


question:
Why is it better to wear a white T-shirt than a dark blue T-shirt in the summer?  
 (A) Light-colored clothes let more air in. (B) Light-colored clothes prevent sweating. (C) Light-colored clothes are not as heavy as dark-colored clothes. (D) Light-colored clothes reflect more sunlight than dark-colored clothes.
answer:

D