<p dir="ltr"><span><span>This sentence is a third conditional. The third conditional describes a situation that didn’t happen in the past and imagines the result of this situation.</span></span></p><p dir="ltr">The third 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 + past perfect, S + would/could/ should/ might + have + past participle.</span></span></p></td></tr></tbody></table></div><p><br></p><p dir="ltr"><span><span>One thing special about this sentence pattern: when the subordinating conjunction “if” is omitted, the auxiliary verb “had” of the past perfect has to be moved to the beginning of the if-clause. In other words, the original if-clause in this question is “If the materials had been ordered on time.” </span></span></p><p dir="ltr"><span><span>Let’s move on to the main clause. Based on the pattern for a third conditional sentence, the blank should follow the structure: would/ could/ should/ might + have + past participle. Thus, the correct answer is Choice (C) </span><span>would have fulfilled</span><span>. </span></span></p>