Enzyme question

The answer is D. I don’t know how to get the answer. Can someone explain this?


I think the answer key is wrong, if D) is the answer we would start with 100% dead cells and then 60 mins later 100% are brought back to life…
For me C) is the best option, we start with 100% colourless alive cells
X is the higher temperature because it will kill the yeast much faster so the slope is on a sharper decline
What do you think? My reasoning might be flawed


That makes sense!Thanks.