<h2>
Hello!</h2>
The answer is:
The correct option, is the second option:
b || c ( b and c are parallel).
<h2>
Why?</h2>
To solve the problem, let's remember the following relationship:
If:

and

Then:

So, from the statement we know that a and b are parallel (a || b), so, if a and c are parallel ( a || c) it means that b and c are parallel ( b || c).
Hence, the correct option is:
The second option, b || c ( b and c are parallel)
Have a nice day!