<p>The correct answer is <strong>(C) expand</strong>.</p>
<p>In this sentence, the company plans to tap into the East European market in order to increase or grow its market share. The word "expand" means to increase in size, scope, or extent, which aligns with the company's objective of growing its market share. The other options do not fit the context as well:</p><p><span style="font-size: 13.008px;">(A) "Operate" means to function or work, but it does not convey the idea of increasing market share.</span></p><p><span style="font-size: 13.008px;">(B) "Strengthen" means to make stronger or more powerful, but it does not specifically refer to increasing market share.</span></p><p><span style="font-size: 13.008px;">(D) "Provide" means to give or supply something, but it does not convey the idea of increasing market share.</span></p>