In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

[Q]: If one mineral can scratch another mineral then that other mineral is softer than that one mineral, as can be tested with (A) a diamond and steel (B) a rock and glass (C) a diamond and agate (D) a ruby and salt
[A]: C


[Q]: Sliding off concrete and onto gravel produces higher levels of (A) shine (B) value (C) longevity (D) chafing
[A]: D


[Q]: Gravitational force never affects (A) balloons (B) stars (C) sunshine (D) air
[A]:
C