TASK DEFINITION: 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.
PROBLEM: Four students tried to find out which magnet was the strongest. They each shared one idea. Which idea shows scientific thinking?  
 (A) We can pick the longest magnet. (B) We can pick the heaviest magnet. (C) We can measure the strength of the magnets. (D) We can vote for the magnet that we think is the strongest.

SOLUTION: C

PROBLEM: In which case does a physical change occur?  
 (A) Ice melts into water. (B) Bread burns in a toaster. (C) A cake bakes in an oven. (D) Two chemicals form a new substance.

SOLUTION: A

PROBLEM: A scientist was examining a large boulder that was covered with lichens (a combination of fungi and algae). He chipped a piece of the rock and placed it under a microscope. He observed that the surface of the rock was breaking down underneath the lichen. Which was the scientist most likely observing?  
 (A) the interaction between abiotic factors (B) the effects of chemical weathering (C) the process of deposition (D) the effects of abrasion

SOLUTION:
B