The land area of australia is about the same size as the land area of
a. saudi arabia.
b. south america.
c. the united kingdom.
d. the continental united states.

The land area of Australia is about the same size as the land area of the continental United States. The correct option among all the options given in the question is option "D". Australia is the sixth largest country in the world in respect to its size. Russia, Canada, Brazil, USA and China have a larger area than the continent of Australia.

Well, a and b together would be negative. b alone would also be negative.