The table above shows the first five ionization energies for a second-period element. Which identifies the element and provides the best explanation?

Notice the large jump in ionization energy from the third to the fourth. This corresponds to the third and fourth electron removed.

Once the outer three valence electrons are removed, a large amount of energy is required to remove the next electron since it is a core electron.

We are looking for a group 13 electron. Of the options, boron matches the described characteristics.