<p>New technologies have <strong>enabled</strong> Poland Cell Tech. to expand its network and explore sales opportunities.</p>
<div>(A) emerged - This option does not fit grammatically or contextually. The verb "emerged" means to come out or become visible, which does not make sense in this sentence. </div>
<div>(B) improved - This option does not fit grammatically or contextually. The verb "improved" means to make something better, but it does not convey the idea of expanding a network or exploring sales opportunities.</div>
<div>(C) introduced - This option does not fit grammatically or contextually. The verb "introduced" means to bring something new into existence or to make it available for the first time, but it does not convey the idea of enabling expansion or exploration.</div>
<div>(D) enabled - This option fits both grammatically and contextually. The verb "enabled" means to make something possible or to give someone the means to do something. In this sentence, new technologies have given Poland Cell Tech. the ability to expand its network and explore sales opportunities.</div>