The sample space contains all possible outputs. Since the coin can land on either heads or tails and the spinner can output A, B, C or D, there are 8 possible outcomes (basically, every output of the spinner can be paired with either heads or tails from the coin):
[tex]\Omega = \{(T,A),(T,B),(T,C),(T,D),(H,A),(H,B),(H,C),(H,D)\}[/tex]