Your answer would be B. until and then both show evidence of time. Hope this helps!
Answer:
The correct answer concerning a subordinate conjunction is letter b. The concert attendees roared their approval while the band played a new song.
Explanation:
Letter A can be eliminated. It joins the sentences only with a semicolon, without any conjunctions.
Letter C does use a comma and a conjunction, "so". However, "so" functions as a coordinating conjunction, not as a subordinating one.
The same goes for letter D. We have a comma and a coordinating conjunction, "and". There is actually an easy acronym to help memorize the coordinating conjunctions: FANBOYS (for, and, not, but, or, yet, so).
The only correct option is letter B. The subordinating conjunction "while" is used to establish a relationship concerning time between the two sentences. Its purpose is to show that both actions took place simultaneously.
Im·mi·nent
/ˈimənənt/
adjective
1.
about to happen.
"they were in imminent danger of being swept away"
synonyms:impending, close (at hand), near, (fast) approaching, coming, forthcoming, on the way, in the offing, in the pipeline, on the horizon, in the air, just around the corner, coming down the pike, expected, anticipated, brewing, looming, threatening, menacing;
informalin the cards
"a ceasefire was imminent"
