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]: Which question will best help a student determine the composition of an unknown substance?  
 (A) Is the sample warm or cold? (B) How valuable is the sample? (C) Has the sample ever been melted? (D) Does the sample conduct electricity?
[A]: D


[Q]: Scientists have measured the rate of growth of the Atlantic Ocean basin to be about 2 to 3 cm per year. This type of activity coincides with the formation of ridges on the ocean floor. What is the most likely cause of this activity?  
 (A) erosion from tidal action (B) the deposition of sediment (C) the flow of continental basalt (D) movement from tectonic plates
[A]: D


[Q]: Which of the following is a trait that a dog does NOT inherit from its parents?  
 (A) the length of its fur (B) the shape of its nose (C) the size of its appetite (D) the color of its fur
[A]:
C