Of the two types of supervolcanoes, only one -- massive eruptions,

These are my reasoning

Ques 1- According to the passage, the eruption of a flood basalt plateau could lead to

A) the collapsing of land into a magma chamber
-> incorrect
This is cause of 'massive eruption'
B) a change in the composition of seawater
-> correct
a flood basalt plateau connected to LIP(Large igneous province)
2nd paragraph explaine about LIP.
Last sentence of 2nd paragraph explained that 'LIP can also reduce the amount of oxygen in seawater to a dangerously low level'
C) the creation of a mantle plume
-> incorrect
This is not result of LIP, but cause of LIP.
Also, there is a word 'perhaps', so we also cannot assure that mantle plume is absolute cause of LIP
D) a volcanic winter
-> incorrect.
This is about 'massive eruption'
E) the wide dissemination of pyroclastic matter
-> incorrect
This is about result of 'massive eruption'

Ques 2- Question Which of the following can be inferred from the passage?

A) The eruption at Lake Toba created a caldera.
-> correct. This is about contents of 1st paragraph
B) Most people would not think of massive eruptors as volcanoes.
-> incorrect. It is possible or not.
C) The force of a meteorite hitting the Earth may be responsible for mantle plumes rising to the lithosphere.
-> Both are cause of 'massive eruption'
D) LIPs have been linked to fewer extinction events than have massive eruptions.
-> Not mentioned. We cannot know about this.
E) Massive eruptors do not release sulfate gases.
-> Not mentioned. We cannot know about this.

Ques3-The primary purpose of the passage is to:

point out the differences between two geological events
-> incorrect.
At 2nd paragraph, we can see the sentence 'Like massive eruption, ~'
: It means that the purpose of passage is not point out difference
discuss the origins of a class of natural occurrences
-> Not mentioned about the origins.
examine a controversial scientific viewpoint
-> incorrect. This passage just explains about phenomenons. There is no viewpoint.
provide a brief chronological outline of a series of cataclysmic events
-> incorrect. There is no chronological ouline.
give an overview of two related phenomena
-> correct. This is only left thing.

Ques 4- Each of the following is described as characteristic of some volcanoes EXCEPT

A) the creation of mountains
-> 2nd sentence of 1st paragraph said 'Unlike lesser volcanoes, massive eruption do not form mountains'
It means that lesser volcano forms mountains.
So A is no problem
B) formations that exist for millions of years after a volcano has been active
-> 4th sentance of 1st paragraph said 'These calderas can last for millions of years after the volcanic activity has subsided'
So B is no problem
C) an overheating of the atmosphere
-> Except!!
No overheating!!
D) very large oceanic provinces
-> LIP forms in oceans ,and is size of continents.
So D is no problem
E) eruptions that have been fatal to humans
-> 'Massive eruptions' killed about 60% of the human population.
So E is no problem