Alright, lets get started.
The given expression is 
Option A :
not equivalent with given expression.
Option B :
not equivalent with given expression.
Option C : 
We could distribute minus sign into parenthesis

or
which is equivalent with given expression.
Option D : 
Distribute 7 into parenthesis

which is equivalent with given expression.
Option E :

Adding similar terms together
which is equivalent with given expression.
Option F :

Adding similar terms together

not equivalent with given expression.
It means option C, D, E are equivalent to given expression. : Answer
Hope it will help :)