This is what the question says:

12) students were asked to write a formula for the
length of a rectangle by using the formula for its
perimeter, p = 21 + 2w. three of their responses
are shown below.
1.1 = {p – aw
ii. 1 = {(p – w)
iii. 1 = p2w
which responses are correct?
a) i and ii, only
b) ii and iii, only
c) i and iii, only
d) i, ii, and iii