A Corpse Was Discovered in an Apartment Last November

A corpse was discovered in an apartment last November. It was that of a 50-year-old male who died of a heart attack. At the time of discovery, the body temperature was determined to be 89∘F. What is the most probable post mortem interval?

A) 2 hours
B) 12 hours
C) 1 hour
D) 4 hours
E) 7 hours