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]: Thomas Edison most likely invented the light bulb by using  
 (A) lit candles. (B) atomic models. (C) reflected light. (D) the scientific method.
[A]: D


[Q]: A lake has been used for more than a century to irrigate crops. How has this practice most likely affected this resource?  
 (A) It decreased the salt content of the water. (B) It increased the evaporation rate of the water. (C) It increased the number of fish in the lake. (D) It decreased the volume of the lake.
[A]: D


[Q]: 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
[A]:
C