"the drink was often flavoured with peppers and spices" -> Supports option 3.
"if you believed, as the Aztecs did, that chocolate was a gift from the Gods and had healing properties" -> Supports option 4.
Option 1 -> They did serve it cold, but that's not what made it palatable
Option 2 -> Wrong, sugar came later with Europeans
Note: Originally answer was 3, but after someone contested it they allowed for both.
You can only choose one of the options, if you choose 3 or 4, you're given marks!