Hey there!
The correct answer is 7/20.
Here is how:
You would need to find out what number goes into both numbers (the denominator and numerator) equally.
The number 2 goes into the numbers 7 and 20 equally. . .
14 ÷ 2 = 7
40 ÷ 2 = 20
= 7/20

I hope this helps you.
Have a great day!
:)