yes. the correct answer is d. i mean why dont choose a? if "dense" has the form of "less dense", why it has not the form of "densest" instead of "least dense"?
yes. the correct answer is d. i mean why dont choose a? if "dense" has the form of "denser", why it has not the form of "densest" instead of "least dense"?
dense, denser, densest less dense, least dense A) is not correct because , "A soft" signifys a following countable noun. So, at least use " a less dense metal" or" the least dense metal"