For Which Process Is the Largest Amount of Energy Required $\rarr$

Multiple Choice

For which process is the largest amount of energy required?

A) Li(g) $\rarr$ Li⁺(g) + e^-
B) B(g) $\rarr$ B⁺(g) + e^-
C) B²⁺(g) $\rarr$ B³⁺(g) + e^-
D) B³⁺(g) $\rarr$ B⁴⁺(g) + e^-
E) Be⁺(g) $\rarr$ Be²⁺(g) + e^-