Please help me with my calculus homework, thanks so much!

SOLUTION:
Step 1:
In this question, we are given the following:
Use geometry to evaluate:
[tex]\int ^2_0(\sqrt[]{4-x^2}\text{ ) }dx[/tex]Step 2:
The details of the solution are as follows:
CONCLUSION:
The final answer is:
[tex]\pi\text{ -- OPTION B}[/tex]