The correct answer is option 2, Goa. Goa is the first state in India to achieve 100 percent households with tap water connections. This means that every household in the state has access to clean and safe drinking water through a tap connection.

Option 1, Gujarat, is not the correct answer because it is not the first state to achieve 100 percent tap water connections.

Option 3, Delhi, is not the correct answer because it is also not the first state to achieve 100 percent tap water connections.

Option 4, Andhra Pradesh, is not the correct answer because it is also not the first state to achieve 100 percent tap water connections.

It is worth mentioning that Goa`s achievement of 100 percent tap water connections is a significant milestone in improving access to clean drinking water for its residents. This accomplishment highlights the effective implementation of initiatives and policies to ensure that every household in the state has access to this basic necessity.