Why do most of the elements try to participate in the chemical combinations?

Q. Why do most of the elements try to participate in the chemical combinations?

i. To gain more electrons

ii. To achieve Inert Gas configuration

iii. To complete their octet

iv. To complete their inner shells

Choose the correct option among the following

A.            Both (i) & (iii)

B.            Both (ii) & (iii)

C.            Only (ii)

D.            Both (i) & (iv)

Answer: Both (ii) & (iii)