Without any calculations it's evident it can't be neither B (both numbers are even, so they're divisible by 2) nor C (the numbers end in 0 and 5, so they're divisible by 5).
A.

Both numbers have a factor of 3, so they're not relatively prime.
That means it must be D. But, let's check it.

Indeed, those two numbers are relatively prime.
It is needed at least one more piece of information.
If you call k the ratio a'b' / ab , the addtional information may be tha cb' has the same ratio to cb or that ca' has the same ratio to ca.
It migh also be that the angle at the vertex C has not changed.
C=3 that’s the answer I think
Answer:
x=36
Step-by-step explanation:
5x=180
x=180/5=36