Final answer:
The statement 'If fish can swim, then 5 + 3 = 15' is a conditional statement and is false because while the antecedent is true, the consequent is false.
Step-by-step explanation:
The student's question concerns a type of logical conditional statement, which is part of mathematical reasoning and logic. The conditional statement here is "If fish can swim, then 5 + 3 = 15." Since fish can indeed swim, the antecedent (the 'if' part) is true. However, the consequent (the 'then' part, 5 + 3 = 15) is false because 5 + 3 actually equals 8, not 15.
When evaluating the truth value of a conditional statement, if the antecedent is true and the consequent is false, the entire statement is false. Therefore, the correct answer to the student's question is B. False.