Consider the experiment in which a coin is tossed repeatedly until a head comes up. Describe the sample space.

• A
  $S = \{ H, TH, TTH, TTTH, TTTTH, \dots \}$
• B
  $S = \{ H, T, TH, TT, TTH, \dots \}$
• C
  $S = \{ H, HT, HTT, HTTT, \dots \}$
• D
  $S = \{ H, TH, TTH, TTTH, \dots \}$