If it rains the match . . . . . . . . cancelled.

The sentence structure is an example of a first conditional, which is used to express a possible future event that is dependent on a certain condition.

In a first conditional sentence, the "if" clause uses the present simple tense, while the main clause (the result clause) uses "will" + base form of the verb to indicate a future outcome.

In this case, "If it rains" is the condition, and "will be" correctly predicts the outcome, which is the match being cancelled.

The other options are incorrect because:

Option A: "be" - Missing the auxiliary "will" for future prediction.

Option C: "will" - Incomplete; missing the main verb "be."

Option D: "will have been" - Incorrect tense for a simple future conditional; this form is used for future perfect tense, indicating an action that will be completed before a certain time in the future.