TASK DEFINITION: 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.
PROBLEM: In a copper wire, a temperature increase is the result of which of the following?  
 (A) an increase in the size of the copper particles (B) a decrease in the mass of the copper particles (C) an increase in the motion of the copper particles (D) a decrease in the distance between the copper particles

SOLUTION: C

PROBLEM: In pea plants, the allele for smooth peas is dominant (S). If a heterozygous smooth pea plant (Ss) is crossed with a homozygous smooth pea plant (SS), which are the possible genotypes the offspring could have?  
 (A) only SS (B) only Ss (C) Ss or SS (D) ss or SS

SOLUTION: C

PROBLEM: A student placed a living green plant in an airtight, transparent container filled with air from the room. The container was exposed to sunlight for one week. At the end of the week the student was to determine which gases had increased in concentration. Assuming enough water and carbon dioxide were available for the proper growth of the plant, which gas would you expect to be present in increased concentration?  
 (A) C (B) NO_{2} (C) O_{2} (D) CO

SOLUTION:
C