How does the volume of a mole of ideal gas relate to pressure and temperature?
Your starting point of reasoning is good, but you misread the equation. The question is about the volume of 1 mole of gas so let's rewrite the ideal gas law to give this relation:
$$P V = n R T \rightarrow \frac{V}{n}=\frac{R T}{P} $$
Now we have the volume of a mole of gas $\frac{V}{n}$ on the left hand side so we can see the proportionalities on the right hand side.

The volume of a mole of gas is inversely proportional to the pressure and directly proportional to the temperature, i.e. 4 in your list of answers