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.

Evidence of organisms that lived on Earth a long time ago would most likely be found in  
 (A) crystals. (B) lava. (C) sedimentary rock. (D) metamorphic rock.
C

Because copper is a metal, it is  
 (A) liquid at room temperature (B) nonreactive with other substances (C) a poor conductor of electricity (D) a good conductor of heat
D

Hawaii is composed mainly of volcanoes with gentle slopes and large surface areas. Which characteristics best describe the lava these volcanoes have released?  
 (A) relatively fluid and low viscosity (B) highly viscous and relatively cool (C) mix of hot gas and rock shards (D) mainly water vapor and large boulders

A