Abstinence and celibacy mean exactly the same thing.
a) Abstinence and celibacy are interchangeable terms, meaning the same thing.
b) Abstinence and celibacy differ slightly in their meanings but generally refer to the same concept.
c) Abstinence and celibacy have distinct meanings and are used in different contexts.
d) Abstinence and celibacy are unrelated terms with no similarities in their definitions.