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.

At what time on a sunny day will the shadow of the school's flagpole be the shortest?  
 (A) sunrise (B) noon (C) mid-afternoon (D) sunset
B

If a student playing the drums hits the drums with greater force, the sound would be  
 (A) quieter. (B) louder. (C) lower in pitch. (D) higher in pitch.
B

Which of these is most likely harmful to an ecosystem?  
 (A) Building new homes in a wetland (B) Taking away airplanes from an airport (C) Planting trees in an orchard (D) Adding floors to an office building

A