Final answer:
OPTION A.
Volcanoes are seen as constructive geological features because they deposit lava that solidifies into new land masses, such as mid ocean ridges and the Hawaiian islands, and contribute to mountain building.
Step-by-step explanation:
Volcanoes are considered constructive because they deposit lava, which eventually hardens into rock. This is evident in processes such as the creation of the mid ocean ridges, which form as lava rises from Earth's mantle at plate boundaries, and in the creation of the Hawaiian island chain. The solidified lava from past eruptions contributes to land mass and can lead to the formation of new islands and mountain ranges.
Moreover, the upwelling lava that does not make it to the surface can still contribute to the formation of geological structures by creating bulges in the crust. Some mountain ranges, like the Sierra Nevada, are a result of this subsurface volcanism. The volcanic process not only brings forth new land but also enables scientists to study material from deep within the Earth, offering insights into Earth's composition and the dynamic processes at work beneath the surface.