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.

[Q]: All of the following are functions of a cell membrane except
(A) surrounding and protecting the contents of the cell. (B) releasing waste products from the cell. (C) producing energy for cell processes. (D) allowing gases to enter the cell.
[A]: C

[Q]: Early scientists most likely saw a discharge of electricity for the first time when observing a
(A) waterfall (B) rainbow (C) lightning storm (D) volcano erupting
[A]: C

[Q]: Approximately 14,000 years ago, the climate in North America began to warm rapidly. At the same time, human hunters migrated to the continent. Which of these most likely resulted from a combination of these two factors?
(A) a reduction in the rate of species change (B) an increase in the rate of large mammal extinctions (C) an increase in the amount of interspecies cooperation (D) a reduction in the total number of small parasitic insects
[A]:
B