The answer is D Seo-Jun enjoys spending time with his friends.
<span>Taking a tiny sip, the chef tasted the soup.</span>
The coordinating conjunctions among these are and and so.
However and therefore are not - they are subordinating.
<span>Past perfect tense is used in this case. This is due to the fact that the events are not in normal chronological order. This tense is used to differentiate when the events happened and put them back into proper order.</span>