The question is asking us to match a list of active volcanoes (List-I) with their respective locations (List-II). The correct answer is option 4, which matches the volcanoes with their correct locations:

A. Mount Merapi is listed as an active volcano. According to option 4, it is located in Indonesia, which is the correct location.

B. Sakurajima is listed as an active volcano. According to option 4, it is located in Japan, which is the correct location.

C. Mount Vesuvius is listed as an active volcano. According to option 4, it is located in Italy, which is the correct location.

D. Mauna Loa is listed as an active volcano. According to option 4, it is located in Hawaii, which is the correct location.

Therefore, option 4, A - 4, B - 3, C - 2, D - 1, is the correct answer as it accurately matches the active volcanoes with their correct locations. The locations mentioned in option 4 are Indonesia, Japan, Italy, and Hawaii, respectively.