Final answer:
The paragraph supports the conclusion that submarine eruptions do not alter the landscape of the seafloor (B).
Step-by-step explanation:
The paragraph states that submarine volcanoes behave differently than volcanoes on land because they erupt into water instead of air. Due to the weight of the water above them, submarine volcanoes usually produce passive lava flows along the seafloor instead of explosive eruptions.
Additionally, the paragraph mentions that most submarine eruptions do not disturb the ocean surface. Based on this information, the BEST conclusion supported by the paragraph is that submarine eruptions do not alter the landscape of the seafloor (option B).