Explanations:In English grammar, the passive voice is used when the focus is on the action rather than the doer of the action. The structure for the passive voice in the present tense is "be + past participle." In conditional sentences, the passive voice is used to express hypothetical situations or conditions. The sentence "If orders are received at the current pace all summer, Turramurra Luggage Company will meet its sales goal one month early" requires a passive voice construction to emphasize the action of receiving orders rather than the doer of the action.
The sentence is discussing a hypothetical situation where orders are being received at a certain pace, and the passive voice emphasizes the action of receiving orders. The correct option is "are received" because it is in the passive voice and present tense, which fits the context of the conditional sentence. The other options are incorrect because they are in the active voice or do not use the correct tense for the conditional sentence.
It is important to understand the difference between active and passive voice and how to use them correctly in different contexts. The active voice emphasizes the doer of the action, while the passive voice emphasizes the action itself. In conditional sentences, the passive voice is often used to express hypothetical situations or conditions, as in this case where the focus is on the action of receiving orders rather than the doer of the action.