A fair coin is tossed four times. What is the probability that at most three tails occur?

• A

  $\frac{7}{8}$
• Correct answer
  B

  $\frac{15}{16}$
• C

  $\frac{13}{16}$
• D

  $\frac{3}{4}$

Hence, the correct answer is option: 'B'.