Final answer:
Boron (B) has the highest first ionization energy among the given elements.
Step-by-step explanation:
The element with the highest first ionization energy among the given options is Boron (B). Ionization energy is the energy required to remove an electron from an atom, and it generally increases across a period from left to right in the periodic table. Boron is further to the right compared to Beryllium, Lithium, and Helium, so it has a higher first ionization energy.