Which word in this sentence is a subordinating conjunction?

Because the ocean washed his love's name away, the speaker is pained.

A. washed

B. Because

C. love's

D. speaker

The only conjunction in this sentence is "because". Washed is a verb, love's is a noun, and speaker is also a noun. So through the process of elimination of the choices given, then the only possible answer is "because" since that is the only conjunction