The world’s most active volcano is:

Cotopaxi
Fujiyama
Kilauea
Vesuvius

The correct answer is (c), Kilauea. Kilauea is an active volcano on the island of Hawaii in the Hawaiian Islands. It is one of the most active volcanoes in the world, and has been erupting continuously since 1983. Kilauea is a shield volcano, which means that it has a broad, gently sloping profile. The volcano is made up of lava flows that have erupted over time. Kilauea is a popular tourist destination, and visitors can hike to the summit of the volcano and view the lava flows.

Option (a), Cotopaxi, is an active volcano in the Andes Mountains of Ecuador. It is the highest active volcano in Ecuador, and the second highest peak in the country. Cotopaxi has erupted several times in the past, most recently in 2015.

Option (b), Fujiyama, is an inactive volcano in Japan. It is the highest mountain in Japan, and is considered to be one of the most beautiful mountains in the world. Fujiyama last erupted in 1707.

Option (d), Vesuvius, is an active volcano in Italy. It is located near the city of Naples, and is one of the most famous volcanoes in the world. Vesuvius erupted in 79 AD, destroying the cities of Pompeii and Herculaneum.