instruction:
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:
The best example of balanced forces is a
(A) car increasing speed. (B) bus parked in a garage. (C) ball kicked along a flat surface. (D) roller coaster slowing down on an incline.
answer:
B

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:
Which is a fact about penguins?
(A) Penguins can live in climates with freezing temperatures. (B) Penguins are fierce competitors. (C) Penguins are some of the most beautiful birds. (D) Penguins make great pets.
answer:
A