I Estimate That the Probability of Heads When Tossing a Coin

Multiple Choice

I estimate that the probability of heads when tossing a coin to be $\hat{p}=\frac{6}{10}$ . Which test will I use to test whether the coin is a fair coin?

A) $H_{o}: \hat{p}>.5, ; H_{1}: \hat{p} \ngtr .5$ .
B) $H_{o}: \hat{p}<.5, ; H_{1}: \hat{p} \nless .5$ .
C) $H_{o}: \hat{p}=.5 ; H_{1}: \hat{p} \neq .5$ .
D) $H_{o}: \hat{p} \geq .5, ; H_{1}: \hat{p} \geq .5$ .