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 tool would be best to use to determine how long it takes a cup of water to boil?  
 (A) balance (B) hot plate (C) stopwatch (D) thermometer

SOLUTION: C

PROBLEM: What MAJOR advantage does nekton have over plankton in locating food?  
 (A) Nekton can actively swim. (B) Nekton can see in the dark. (C) Nekton do not eat much food. (D) Nekton can eat anything in the ocean.

SOLUTION: A

PROBLEM: How much time is required for a bicycle to travel a distance of 100 m at an average speed of 2 m/s?  
 (A) 0.0 (B) s B 50 s (C) 100 s (D) 200 s

SOLUTION:
B