The answer is: A
Explanation
The correct option is A. A necessary party is one in whose absence no order can be made effectively.
This means that a necessary party is indispensable to the constitution of the suit, and without whom the suit must fail. If a necessary party is not impleaded, the suit itself is liable to be dismissed.
A proper party, on the other hand, is one in whose absence an order can be made but whose presence is necessary for a complete and final decision on the question involved in the proceeding. A proper party is not a mandatory party to the suit, but his presence enables the court to adjudicate more effectually and completely. In case of a proper party, the suit will not be dismissed, but the court may order his joinder if it deems fit.