<p dir="ltr"><span><span>This question sentence is a first conditional. The first conditional predicts what will happen in the future. </span></span></p><p>The first conditional:</p><div dir="ltr" align="left"><table class="classic-table"><colgroup><col></colgroup><tbody><tr style=""><td><p dir="ltr"><span><span>(1) If + S + simple present, S + will/ can/ shall/ may + the basic form of a verb</span></span></p><p dir="ltr"><span><span>(2) If + S + simple present, an imperative sentence. </span></span></p></td></tr></tbody></table></div><p><br></p><p>Based on Pattern 2: If + S + simple present, an imperative sentence, the answer is (A) "request". </p><p>In most cases, an English sentence should have at least one subject, but there are exceptions: imperative sentences. An imperative sentence starts with the basic form of a verb without being preceded by any subject. Thus, the main clause should be an imperative sentence, and the blank should be filled with the basic form of a verb. <br></p>