Answer:
d. Then there's the endorsement that often features someone's voice describing the product.
Step-by-step explanation:
Subordinating conjunctions are a type of conjunctions that acts as the glue to attach the subordinate clause in the sentence. It basically introduces the subordinate clause, through which we can easily identify the subordinate clause.
There are numerous subordinate conjunctions, among which the most common are which, whatever, than, when, while, that, if, etc. Therefore, the sentence that contains subordinating conjunction and thus, a subordinate clause is the sentence (d).
In this sentence, the subordinate conjunction is "that". Thus, the correct answer is option d.