(A) There is intelligent life on other stars.
(B) The Moon is made entirely of cheese.
(C) Isaac Newton was the greatest scientist.
(D) There is beauty in a sunset.
(A) There is intelligent life on other stars.
No. --- To disprove this statement,
you need to search the whole universe.
Also, they might be hiding.
(B) The Moon is made entirely of cheese.
Yes.
The statement can be disproven by trying
to eat some moon rocks.
(C) Isaac Newton was the greatest scientist.
(D) There is beauty in a sunset.
No.
Cannot be disproven because there is no
agreed-upon definition of "beauty".