The correct option is B First Conditional
The first conditional is used to refer to future actions that are dependent on the result of yet another future event, but when there is a pronounced possibility of the condition for the event being satisfied. The structure for the first conditional is: if + present tense, will + verb. In this case, the verb is 'to be' and thus the sentence adheres to the structure of the First Conditional - i.e, Option A).