Answer:
50% B
Step-by-step explanation:
For a coin tossed once, the sample space is 2 i.e {H,T}.
If a coin is flipped once, the probability that it will land a head{H} is 1/2.
Since the possible outcome is 1 i.e the head and the total outcome is 2 which is the sample space.
Probability = Possible outcome of event/total outcome = 1/2 i.e 50%
Note that the number of times the coins has been initially flipped doesn't affect the probability of the next flip which will always be 1/2 for each flip since the coin can either land with a head or a tail.