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: How much time is required for a bicycle to travel a distance of 100 m at an average speed of 2 m/s?  
 (A) 0.02 s (B) 50 s (C) 100 s (D) 200 s

Answer: B


Question: What occurs if the body's renal system fails to work?  
 (A) Gas exchange is impaired. (B) Blood oxygenation no longer occurs. (C) Metabolic waste builds up in the blood. (D) Nutrients are no longer transported to organs.

Answer: C


Question: Several tomato plants are grown indoors next to a sunny window. The plants receive water and fertilizer and remain on the windowsill. What will most likely happen?  
 (A) Most of the leaves on the window side will wilt and die. (B) The roots of the plants will grow upward from the soil. (C) Water droplets will collect on the leaves facing away from the window. (D) The stem will bend toward the window.

Answer:
D