Answer:
A. 

Explanation:
We have been given that Amira needs 
 feet of fencing material to make a fence for her small garden. We are asked to find the additive inverse of our given number.
 feet of fencing material to make a fence for her small garden. We are asked to find the additive inverse of our given number.
We know that additive inverse of a number is that number, which we add to a number to create the sum of zero.
The sum of 
 and
 and 
 will be 0, therefore, our correct choice is option A.
 will be 0, therefore, our correct choice is option A.