At One School, the Average Amount of Time That Tenth-Graders $\begin{array}{l}\mathrm{H}_{0}: \mu=21.6 \text { hours } \\\mathrm{H}_{\mathrm{a}}: \mu<21.6 \text { hours }\end{array}$

At one school, the average amount of time that tenth-graders spend watching television each week is 21.6 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average
Amount of time spent watching television per week has decreased. The hypotheses are:
$\begin{array}{l}\mathrm{H}_{0}: \mu=21.6 \text { hours } \\\mathrm{H}_{\mathrm{a}}: \mu<21.6 \text { hours }\end{array}$
Explain the meaning of a correct decision.

A) Failing to reject the hypothesis that $\mu=21.6$ hours when in fact $\mu=21.6$ hours OR concluding that $\mu<21.6$ hours when in fact $\mu<21.6$ hours
B) Concluding that $\mu>21.6$ hours when in fact $\mu<21.6$ hours
C) Failing to reject the hypothesis that $\mu=21.6$ hours when in fact $\mu<21.6$ hours
D) Concluding that $\mu<21.6$ hours when in fact $\mu=21.6$ hours