Which of the following sentences use correct end punctuation?
(a)-does this system track all parts ordering for the c45 model.
(b)-fire him. will you file these invoices?
(c)-when he became coo, ninheh asked to have his diploma from carnegie mellon placed next to his picture in the hallway.
(d)-our workgroup is going to lunch with the division manager next monday, aren’t we?

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.  

the answer is c? i just got it write

i think that the answer is substandard.