Question

which fact supports anthonys opinion that all adults should have the right to vote?
we, the whole people, who formed the union.
they are denied the use of the only means of securing them...
and it is a downright mockery to talk to women...
not to give the blessings of liberty...

Explanation:

The phrase "we, the whole people, who formed the Union" implies that all people (including all adults) are part of the entity that formed the Union, which can be used to support the idea that all adults should have the right to vote as they are part of the whole people. The other options focus more on denial of means (like the ballot) or mockery towards women specifically rather than directly stating the inclusion of all adults as a basis for the right - to - vote.

Answer:

we, the whole people, who formed the Union.