Which of the following has the smallest number of molecules?

Question

$\begin{array}{1 1}(a)\;22.4\times 10^3mL\;of\;CO_2\;at\;NTP\\ (b)\;22g\;of\;CO_2\;gas \\(c)\;11.2L\;of\;CO_2\;gas\;at\;NTP\\(d)\;0.1\;mole\;of\;CO_2\;gas\end{array}$