Find the absolute value and the opposite of the integer.
57
a.
the absolute value is –57 and the opposite is –57.
b.
the absolute value is 57 and the opposite is 0.
c.
the absolute value is 57 and the opposite is –57.
d.
the absolute value is 0 and the opposite is –57.

The absolute value is always non-negative!

So the absolute value of 57 is 57 itself, as it's non-negative (i.e. it's positive or 0).

Opposite value is the number with a different sign: an opposite value of a positive number is negative, so here it will be -57 .

The correct answer is C.