What would be the best supporting sentence for a paragraph about bicycle fatin
A. You can lessen your chances of being injured while cycling by
taking a few simple safety precautions.
B. You can make yourself more visible to cars by putting flashing
lights on the front and back of your bicycle.
C. It's worth spending a little extra time and money to be sure you are
as safe as possible when cycling.
D. Some people ride road bikes, some ride BMX bikes, and some
prefer mountain bikes.

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.