If Dinosaur DNA Has Deteriorated, Then It Is Impossible to Recreate

Multiple Choice

If dinosaur DNA has deteriorated, then it is impossible to recreate dinosaurs. If dinosaurs perished long ago, then dinosaur DNA has deteriorated. Hence, if dinosaurs perished long ago, then it is impossible to recreate them.

A) Constructive dilemma.
B) Affirming the consequent.
C) Pure hypothetical syllogism.
D) Modus tollens.
E) Invalid.