Answer
Remember that weak acids have strong conjugate bases while strong acids have weak conjugate bases.
Work Step by Step
The answer to part b is in order of decreasing stability of conjugate bases, which means it is in order of increasing basicity. Their conjugate acids are therefore in the order of decreasing acidity (which is the answer to this part). Simply take the answer from part b and add H+ to each base. Keep the order of the compounds.
