Hello there!
The answer should be the last option D.
Solve b.
First you had to flip by the equation.
[tex]\frac{1}{2} bh=a[/tex]
Then divide by h/2 from both sides.
[tex]\frac{1}{2}bh/\frac{h}{2} =\frac{a}{h}/2[/tex]
Simplify should be the correct answer.
[tex]b=\frac{2a}{h}[/tex]
Hope this helps!
Thank you for posting your question at here on Brainly.
-Charlie
