<p dir="ltr">The sentence in this question is a first conditional. </p><p dir="ltr"><span><span>The first conditional sentence predicts what will happen in the future. </span></span></p><p dir="ltr">The first conditional:<span><span><br></span></span></p><div dir="ltr" align="left"><table class="classic-table"><colgroup><col></colgroup><tbody><tr style=""><td><p dir="ltr"><span><span>If + S + simple present, S + will/ can/ shall/ may + the basic form of a verb</span></span></p><p dir="ltr"><span><span>If + S + simple present, an imperative sentence. </span></span></p></td></tr></tbody></table></div><p><br></p><p dir="ltr"><span><span>Following this sentence pattern, the if-clause should be in the simple present tense. Thus, the correct answer is (A) </span><span>customizes</span><span>.</span></span><br></p>