Select the answer choice in which a dependent clause is underlined.

a. Edgar Allan Poe is considered to be the inventor of the detective story.

b. Writers all over the world have imitated his tales of mystery and supernatural events.

c. He earned his living as a writer, but he was in financial
difficulties for most of his short life.

d. Though the cause of Poe's death is unknown, many believe that poor health and habits were probably the main factors.

the answer is a.

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a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.