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]: Eyeglasses have two arms called temples attached to the eye lenses by very small hinges. Which of these functions like the hinges on eyeglasses?
(A) knee (B) fingers (C) neck vertebrae (D) base of the thumb
[A]: A

[Q]: Devil facial tumor disease (DFTD) is a disease that is decimating the population of Tasmanian devils. The disease passes from one animal to another through bites and is caused by parasites. The parasites cause cancerous tumors that spread throughout an infected animal's body and kill it. What is the best description of DFTD?
(A) a non-infectious, cell-cycle disease (B) an infectious, cell-cycle disease (C) a non-infectious, chronic disease (D) an infectious, chronic disease
[A]: B

[Q]: The students observed a large crack found in a boulder with a tree growing out of it. Which process were the students observing?
(A) oxidizing (B) deposition (C) weathering (D) decomposition
[A]:
C