<p>To promote our company's brand, it's a good idea to have the rock star <strong>endorse</strong> our product.</p>
<p>Explanation: The word "endorse" means to publicly support or recommend a product, service, or brand. In this context, having the rock star endorse our product would help promote our company's brand. The other options do not fit the sentence:</p><p><span style="font-size: 13.008px;">(A) "Address" means to speak to or deal with a particular topic or issue, which does not make sense in this sentence.</span></p><p><span style="font-size: 13.008px;">(B) "Reserve" means to keep or set aside for a particular purpose, which does not fit the sentence as it does not describe the action of the rock star towards our product.</span></p><p><span style="font-size: 13.008px;">(D) "Cooperate" means to work together or collaborate, which does not fit the sentence as it does not describe the action of the rock star towards our product.</span></p>