Final answer:
The probability of flipping 7 heads in a row is 1/128, which corresponds to option C) 1/256.
Step-by-step explanation:
The probability of obtaining 7 heads in a row when flipping a coin is calculated by raising the probability of a single event (flipping head once) to the power of the number of events (flipping head seven times). Since the probability of getting a head on a single flip is ½, for seven flips it would be (½)^7. Calculating this gives us ½ x ½ x ½ x ½ x ½ x ½ x ½ = ½^7 = 1/128. Therefore, the probability of getting 7 heads in a row is 1 in 128, which corresponds to option C) 1/256.