Answer: Choice B) 33, 44, 55
The pythagorean theorem is a^2 + b^2 = c^2. A pythagorean triple is a set of positive whole numbers (a,b,c) such that all three numbers make that equation true. The 'c' is always the largest value. The order of 'a' and 'b' doesn't matter though usually 'a' is the smaller of the two. If we go through all the answer choices, we'd see that only choice B fits because
a^2+b^2 = 33^2+44^2 = 3025
and c^2 = 55^2 = 3025
therefore 33^2+44^2 = 55^2 is a true equation