The number of radial node/s for 3p orbital is:

A point or plane of an orbital where the electron density of the electron of an orbital is zero is called a node. Nodes can be two types; one is a radial node and another one is an angular node.

Number of radial node$= n - l - 1$

Now, for $3p$ orbital, the value of $n$ is $3$, and the azimuthal quantum number is $1$. Therefore, the number of radial node is, $n - l - 1 = ( 3 - 1 - 1 ) = 1$

Hence, ans will be $A$