A certain mass of a gas occupies a volume of $2L$ at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant ?

Question

$$\begin {array} {1 1} (a)\;100\;K & \quad (b)\;273\;K \\ (c)\;273^{\circ}C & \quad (d)\;546^{\circ}C \end {array}$$