If p: A man is happy.
   q: A man is rich. Then, the statement, 'If a man is not happy, then he is not rich' is written as

• A

  $~\mathrm{p}\to \sim \mathrm{q}$

• B

  $~\mathrm{q}\to \mathrm{p}$

• C

  $~\mathrm{q}\to \sim \mathrm{p}$

• D

  $\mathrm{q}\to \sim \mathrm{p}$