Final answer:
Maui is composed of two volcanoes, Mauna Kahalawai and Haleakalā, making option a) Maui & Moloka'i the correct answer.
Step-by-step explanation:
The Hawaiian Islands are a chain of volcanic islands formed by the hotspot activity underneath the Pacific Plate. When addressing which islands today are composed of exactly two volcanoes each, we can use the information about the volcanic formations of these islands. Although not explicitly mentioned, the island of Maui is known to be formed by two shield volcanoes, Mauna Kahalawai (the West Maui Mountains) and Haleakalā, which makes a) Maui & Moloka'i the correct answer to the question.