Answer:

Explanation:
Given
See attachment for her sketch
Required
Which equation do not represent the perimeter
From the attached sketch:
--- Length
--- Width
Perimeter (P) is calculated as:

This gives:
---- This represents (A)
Open bracket
---- This represents (B)
In algebra:
means

So, the expression becomes
--- This represents (D)
This implies that (C) does not represent the perimeter