The correct answer is A. shortage.
A shortage is a lack of something that is needed. In this case, there is a lack of milk in Delhi. This could be due to a number of factors, such as a decrease in the supply of milk, an increase in the demand for milk, or a combination of both.
A shortage can have a number of negative consequences. For example, it can lead to higher prices for milk, and it can also make it difficult for people to get the milk they need.
There are a number of things that can be done to address a shortage of milk. For example, the government can provide subsidies to farmers to encourage them to produce more milk. The government can also import milk from other countries.
B. abundance means a large quantity of something. In this case, there is not a large quantity of milk in Delhi.
C. excess means more than is needed or wanted. In this case, there is not more than is needed or wanted for milk in Delhi.
D. sufficiency means enough to meet a need. In this case, there is not enough milk in Delhi to meet the need.