Answer:
Ads that tell a story are found most often in commercials, as a story relies on multiple images and a sequence of events.
Step-by-step explanation:
Subordinating conjunctions are words that are used to link a dependent clause to an independent clause. In the selected sentence above, 'as,' is the subordinating conjunction that shows cause and effect. In this sentence, the first clause,
Ads that tell a story are found most often in commercials
is the independent clause because it can stand alone and still make a meaning.
The second clause which begins with the subordinating conjunction, 'as', is the dependent clause because it relies on the first clause to make a complete meaning. It serves as a clause that indicates purpose.