I think you did misinterpret the question. The stem says
Which
three of the following numbers NOT two you have take multiplication of.
You must multiply THREE of the 4 answer choices
That said, a shortcut is to compare the fraction in couples
\(\frac{-15}{17} = \frac{-17}{17} + \frac{2}{7} = -1 + \frac{2}{17}\)
\(-\frac{18}{19} = -\frac{19}{19} + \frac{1}{9} = -1 + \frac{1}{19}\)
Now, comparing the first and the second, disregarding -1 which is equal in both fractions, \(\frac{2}{17} > \frac{1}{19}\)
Doing this proces you will get the answer.
A key concept here is that ALL the answer choices are negative. However, you should notice at a glance that certain fractions are between -1 and zero. Others are less than -1. We care only of the latter
Regards
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