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.

[Q]: An astronomer observes that a planet rotates faster after a meteorite impact. Which is the most likely effect of this increase in rotation?  
 (A) Planetary density will decrease. (B) Planetary years will become longer. (C) Planetary days will become shorter. (D) Planetary gravity will become stronger.
[A]: C


[Q]: All of the following are part of an animal life cycle except  
 (A) growth. (B) fertilization. (C) binary fission. (D) gamete development.
[A]: C


[Q]: What is one condition necessary to produce diamonds?  
 (A) high altitude (B) intense pressure (C) quick cooling (D) low temperatures
[A]:
B