Problem: Here is a premise:
Also, is it not possible that she may have taken an overdose of her medicine by accident?"

Here is a hypothesis:
Is it not possible that she would accidentally take too much medicine?

Here are the options:

Answer: yes

Problem: Here is a premise:
He's welcome to her money."

Here is a hypothesis:
Because she adores him, he's welcome to the money she has.

Here are the options:

Answer: it is not possible to tell

Problem: Here is a premise:
And then, how could he know it was her coffee?

Here is a hypothesis:
What would have distinguished her coffee from the others?

Here are the options:

Answer: yes

Problem: Here is a premise:
We planned to get a herd of mavericks, drive up into Kansas or Missouri, an' sell.

Here is a hypothesis:
We planned to get rich selling mavericks.

Here are the options:

Answer:
it is not possible to tell