In this question, we are given a list of variants of COVID-19 (List-I) and their respective countries where they were first identified (List-II). We need to match the variants with their corresponding countries of origin.

Looking at the options provided, we can see that option 1 has the correct matching:

A. Alpha - First identified in Britain (3)

B. Beta - First identified in South Africa (4)

C. Gamma - First identified in Brazil (2)

D. Delta - First identified in India (1)

Therefore, option 1 is the correct answer.

All the other options have incorrect matching of the variants with their respective countries of origin.

It is important to note that the information provided in the options is correct as of the time of this question. However, the situation regarding the identification and naming of COVID-19 variants may change over time and new variants may emerge in different countries. Therefore, it is always important to stay updated with the latest information from reliable sources.