Select the adverb clause to complete the sentence.
the pangolin is possibly the most endangered animal in the world.
a. because some people hunt it for its scales,
b. though only a small creature,
c. in spite of conservation efforts,
d. while similar to the anteater,

The adverb clause to complete the sentence is Because some people hunt it for its scales,

Explanation:

The final sentence is Because some people hunt it for its scales, the pangolin is possibly the most endangered animal in the world. An adverb clause is a group of words that function as an adverb, they explain how or why things happen, in this sentence they are explaining why the pangolin is the most endangered animal in the world.