If P(r) Is the Radial Probability Density for a Hydrogen $\mid$

Multiple Choice

If P(r) is the radial probability density for a hydrogen atom then the probability that the separation of the electron and proton is between r and r + dr is:

A) P dr
B) $\mid$ P $\mid$ ² dr
C) 4 $\pi$ r²P dr
D) 4 $\pi$ r² $\mid$ P $\mid$ dr
E) 4 $\pi$$\mid$ P $\mid$ dr