Answer
(a)
Work Step by Step
To solve the limit, we wish to apply the property
$\lim _{x \rightarrow 0} \frac{\sin x}{x^{2}}$.
In order to do this, we would have to use the substitution
$\theta=5h$
Where $\theta$ would function as "$x$" in the above equation.
Thus, (a) is the right answer.
