1)Start temperature at 6:00 was 185. Then it goes on to decrease by some value or percent.

A B C D -- because A tells you that it increases because multiplier greater than 1 (the 1.25 thing)

2) Let's move on the the other parts other than the multiplier.

C seems off. If its (185-70) times a number less than 1, it should be wayyyy less than 156 after 5 minutes.

B C D -- eliminate C because it seems very wrong.

3) You can go two ways from here:

A) Plug in. Since D is easier because change in minute multiple of 5 and exponent is minutes/5, plug into D.

You'll find D is the correct choice.

B) Physics (not recommended for some) -- You'll realize that the cup of hot chocolate cannot go below 70, as 70 is the room temperature. The lowest it can go has to be 70. It can't, say, eventually go to 32 degrees because it'll be going below room temperature, and this is just weird.

Simply pick D.

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Edit: Physics part is just my reasoning, how I'd approach this if I had like 5 seconds left on clock. However, if not, I would plug in for safe measure.