Which survey question is biased?

A. Which – fall, winter, spring, or summer – is your favorite season?
B. Which sport is your favorite: baseball, basketball, football, or tennis?
C. Which do you like better, television or video games?
D. Which do you like better, coffee or fresh, tasty water?

D. Which do you like better, coffee or fresh, tasty water? (this question is leading the respondent to choose water over coffee, making it biased)