Which revision correctly uses an appositive phrase to combine these two sentences?

my brother's prized possession is a small toy ambulance. he often keeps it in his pocket.

a. my brother often keeps a small toy ambulance in his pocket because it is his prized
possession.
b. my brother often keeps a small toy ambulance in his pocket, which is his prized
possession.
c. my brother's prized possession is a small toy ambulance, and he often keeps it in his
pocket.
d. my brother often keeps his prized possession, a small toy ambulance, in his pocket.

d

explanation:

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.