Find y.

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Use a² + b² = c²

c = 60 (for it is opposite of the right angle, and so is the longest side)
a = 36
b = y

Plug into the equation

36² + y² = 60²

Simplify

y² + 1296 = 3600

Isolate the y, subtract 1296 from both sides

y² + 1296 (-1296) = 3600 (-1296) 
y² = 3600 - 1296
y² = 2304

Isolate the y, root both sides

y² = 2304
√y² = √2304
y = √2304
y = 48

C)48 is your answer

hope this helps