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.

The relationship between ticks and a dog can best be described as  
 (A) mutualism. (B) competition. (C) parasitism. (D) commensalism.
C

Which unit is used to indicate the amount of energy in food?  
 (A) ounce (B) degree (C) calorie (D) gram
C

If two organisms are classified in different orders but are in the same class, which of these statements is true?  
 (A) The organisms have the same genus. (B) The organisms are in the same phylum. (C) The organisms are in different kingdoms. (D) The organisms are members of the same species.

B