The correct answer is A) If you don't study for the exam, your parents will be disappointed.
The sentence written in the conditional mood is “If you don't study for the exam, your parents will be disappointed.”
In grammatical, the conditional mood is a mood used to express or state a proposition that is valid if some other condition is presented. This is, an action will depend on some other condition.
Also, conditional tenses are used for speculation about what could happen in any case, what might have happened, and what we wish would happen. Most sentences using the conditional contain the word “if”.
For instance, “If you do exercise, you will have a beautiful body.”