Final answer:
The 4p subshell can hold a maximum of 6 electrons, as calculated using the formula 2(2l + 1) and knowing that 'l' equals 1 for any p subshell.
Step-by-step explanation:
The question asks how many electrons can exist in the 4p subshell. According to the principle that defines the maximum number of electrons that can be in a subshell, the formula to use is 2(2l + 1), where 'l' is the angular momentum quantum number for the subshell. For a p subshell, the value of 'l' is always 1. Using this formula, we find that the maximum number of electrons in any p subshell is 2(2(1) + 1) = 2(2 + 1) = 2(3) = 6 electrons. Therefore, the correct answer is B) 6.