It was written correctly :)
Answer:
B)comemos
Explanation:
It would be comemos because Nosotros changes the ending of the verb to emos or omos.
Answer: It looks like you just need to cut off the last vowel (and consonant if there is one) of the word.
For number one, it's "perezosísimo"
For question 2, it's "aburridísimo"
For question 3, I think you do the same but keep it plural, so "interesantísimos" I would imagine.