$\"\"$

The differential equation is $\"\"$ .

$\"\"$

Apply integral on each side.

$\"\"$

Consider $\"\"$ .

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

$\"\"$ .

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

Apply formula: $\"\"$ .

$\"\"$

Substitute $\"\"$ .

$\"\"$ .

Therefore, the correct choice is option $\"\"$ .

$\"\"$

The correct choice is option $\"\"$ .