Answer:
The correct option is option C. subordinating
Step-by-step explanation:
Conjunctions are defined as words used to link phrases, clauses or even other words together, In other words, conjunctions avoid express ideas in a series of short sentences. They can be classified in Coordinating Conjunctions, Correlative Conjunctions, and Subordinating Conjunctions.
Specifically, the last group of conjunctions, Subordinating conjunctions, are used to join independent and dependent clauses. They often show a cause-and-effect relationship, as well as a contrast between the clauses.
some of the common subordinating conjunctions are until, when, whenever, where, whereas, wherever, whether or not, while, because, since, as, although, and though, to name a few.
Bearing in mind the described above, in the sentence, Terry jumps up WHENEVER anyone rings the doorbell, WHENEVER corresponds to subordinating conjunction.