Answer:
A. the difference of two squares
Explanation:
we are given
![x^2-121](https://img.qammunity.org/2020/formulas/mathematics/high-school/cpf1o7pzunkxxjhanmk6ezv3xj9gi4nu42.png)
we can write
![121=11* 11](https://img.qammunity.org/2020/formulas/mathematics/high-school/xu6ewegc5mlivbp9ycpxnza1fz7bn9dot3.png)
![121=11^2](https://img.qammunity.org/2020/formulas/mathematics/high-school/jbslyx8s6zsvghqghtwnd9np20p2jp7y9s.png)
so, we can see that
x^2 is square
11^2 is also square
so,
![x^2-11^2=square-square](https://img.qammunity.org/2020/formulas/mathematics/high-school/n8hc9xsng96zx1b14uydw2dt1datful5pm.png)
It means that
two squares are subtracted
so, it is difference of two squares
so,
A. the difference of two squares