The correct option is
A will be, come
This is a conditional statement as it contains the conjunction, "if". Conditional sentences are statements that discuss a hypothetical event (expressed by the conditional clause which begins with "If) and its consequences (in the main clause). The conditional clause is in the format" "If+ subject+ simple present tense of main verb.
In the given statement, the conditional clause is: "If you _____". The present tense form of the verb, "come" is "come". Hence, the answer has to be either option A or C . Options B and D are incorrect as they use the past tense form i.e "came" and present continuous tense i.e "are coming", respectively.
The main clause is in the format, "Subject + verb in future tense" as it is yet to happen and indicates the consequence of the conditional clause. The main clause is "Iman ______ happy".
Option C is incorrect as the word, "is" is the simple present tense form of the verb, "be" (and not the future tense).
The future tense of the verb, "be" is "will be". Hence, "Iman will be happy" is the correct form of the main clause. Option A is correct.