Answer:
C. 4/5
Explanation:
this is a special right triangle
its a 3 4 5 right triangle
where 5 is the hypotenuse
divide x y z by 5 & you'll see
mnemonic device :
soh cah toa
sine is opposite ÷ hypotenuse
sine of A is Y ÷ Z or Y/Z
sine of A is 20/25
simplified it's 4/5