a
\(\because\) \({\theta _1} < {\theta _2}\) \(\Rightarrow\)  \(\tan {\theta _1} < \tan {\theta _2}\)

\(\Rightarrow\) \({\left( {\frac{V}{T}} \right)_1} < {\left( {\frac{V}{T}} \right)_2}\)

\(PV = \mu RT\) from \(\,\frac{V}{T} \propto \frac{1}{P}\)

So,  \({\left( {\frac{1}{P}} \right)_1} < {\left( {\frac{1}{P}} \right)_2}\) \(\Rightarrow\) \({P_1} > {P_2}\)