Answer: Option (a) is the correct answer.
Step-by-step explanation:
Boron (B), has atomic number 5 and its electrons in the shells are distributed as 2, 3.
This means there are 3 valence electrons in a boron atom. So, in order to gain stability boron will loose 3 electrons and obtain a charge of +3.
Thus, we can conclude that B change to gain stability as it lose 3 electrons.