Q. Can three people comfortably sit in the back seat - Amaze?

Yes, unless two of them are oversized. Honda ( Amaze as well as city) as very spaciously designed for long time comfort their boots are also spacious - 420 litres. The suspension and drive are also very smooth compared to other cards.

Hey True, The amaze is quite spacious in the rear both in terms of leg space and the cabin width , so three people can sit comfortably.

Yes. Enough space to sit comfortably unless Passengers are very Obese (Fast)