Answer:
A: I really like the kind of the tablet
B: I really like the kind of cell phone
C: I really like ecology class
D: I really like the class of the charger
(Definitely not D, I'd say C)
Answer:
"usted" is the more formal way to speak to an adult or someone older than you in Spanish while "tu" can be used when you're speaking to someone like a friend and that you have a chill and laid back connection with.
Explanation: