Find the Probability for the Experiment of Tossing a Coin $S = \{ H H , H T , T H , T T \}$

Multiple Choice

Find the probability for the experiment of tossing a coin two times.Use the sample space $S = \{ H H , H T , T H , T T \}$ .
The probability of getting at least two heads.

A) $\frac { 1 } { 2 }$
B) $\frac { 1 } { 5 }$
C) $\frac { 1 } { 4 }$
D) $\frac { 1 } { 8 }$
E) $\frac { 1 } { 3 }$