Which sentence uses comparison correctly? A. Which tastes gooder to you, a hearty soup or a fresh salad? B. Which tastes best to you, a hearty soup or a fresh salad? C. Which tastes more better to you, a hearty soup or a fresh salad? D. Which tastes better to you, a hearty soup or a fresh salad?

D is the only one that follows conventional grammar rules.

The rest are wrong because ...

A - gooder is not a word

B - you are only comparing 2 things so you would say best, you would say better. The rule is 'good, better, best.' Best is only used to compare multiple things

C - You already said better so you don't need another adjective, more, to support that