TASK DEFINITION: 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.
PROBLEM: Which of the following is an observation about grasshoppers that a science class could have made on their nature walk?  
 (A) The grasshoppers will live longest in a container filled with plants. (B) The grasshoppers are green with long back legs and antennae. (C) The grasshoppers will probably eat more grass than tree leaves. (D) The grasshoppers all hatched from eggs laid the year before.

SOLUTION: B

PROBLEM: A scientist makes a discovery while performing an investigation, but fails to maintain clear records of the tests performed. In which way does a lack of record keeping affect a scientist's work?  
 (A) It invalidates the procedures and conclusions. (B) It makes the data obtained in the study incorrect. (C) It prevents other scientists from validating the results. (D) It prohibits other scientists from developing new hypotheses.

SOLUTION: C

PROBLEM: Michael claims he can use the bands on a woolly caterpillar to predict winter. He says long black bands mean a hard winter, and short black bands mean a mild winter. Last week he found three woolly caterpillars with long black bands. Which of the following do his observations show?  
 (A) Evidence that his claim is correct (B) Evidence that his claim is wrong (C) Proof that there is going to be a hard winter (D) Neither proof nor disproof for his claim

SOLUTION:
D