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.

[EX Q]: Which are examples of inherited traits?  
 (A) specific beliefs (B) fingerprints (C) memories (D) nose shape
[EX A]: D

[EX Q]: What type of force keeps the planets orbiting the Sun?  
 (A) gravitational (B) magnetic (C) electrical (D) nuclear
[EX A]: A

[EX Q]: Which of the following is a crucial piece of evidence supporting scientists' theory of how the continents and the ocean basins formed?  
 (A) Gravitational forces result in the fusion of small atoms. (B) A differentiated iron core expresses magnetic properties. (C) Currents redistribute heat in an unevenly heated liquid. (D) A stream of charged ions disperses lightweight gases.
[EX A]:
C