The Q Value of the Reaction Is -1

The Q value of the reaction is -1.65 MeV.What is the threshold energy of this reaction? (Hint: Once the Q value is known,the relative mass numbers are precise enough to yield the result to 3 significant figures,actual masses not being needed) .

A) 1.65 MeV
B) 1.89 MeV
C) 1.77 MeV
D) 1.41 MeV