Which orbital has the most radial nodes?

Orbital, which has the most radial nodes, is $4s$.

The total number of radial nodes is n-l-1.
Where n denotes the principal quantum number and l the azimuthal quantum number.
For 4s = 4 − 0 − 1 = 3
For both 4d = 4 – 2 – 1 = 1 and
For 4p =4 – 1 – 1= 2

Hence, option A is correct.