Find the valency of an element

Amir was asked to find valency of the element whose atomic number was

15

Below are his steps:

Step 1:

The electronic configuration is

2

8

5

Step 2:

It has

5

valence electrons.

Step 3:

To attain a complete octet, atom needs to lose

5

electrons, so its valency is

5

Where did he go wrong and why?

(Choice A)
$Step 3$ ‍ is wrong. Valency cannot be $5$ ‍ because it is difficult for an atom to lose $5$ ‍ electrons.
(Choice B)
$Step 3$ ‍ is wrong. Valency is $5$ ‍ because it gains $5$ ‍ electrons, not loses.
(Choice C)
$Step 2$ ‍ is wrong because valence electrons should be $3$ ‍, not $5$ ‍.
(Choice D)
He didn't make a mistake.

Class 10 Chemistry (India)