The correct option is D pass
This sentence shows a fact and is making a statement about a real and possible situation. Hence, it is using first conditional that employs forms of verbs in present and future tenses. In the structure of first conditional "If" Clause is given in simple present tense. So, Option C is the correct answer here as it has verb of present tense. Options A, B and C cannot be used as they would render the sentence grammatically incorrect.