Not all men assembling a grill are preparing for a grilling competition.
This justifies what answer for what question? Q & A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Given the sentence "Two men are outside while assembling a grill." is it true that "There are men preparing for a grilling competition."?
it is not possible to tell