B because it’s the first word I don’t know how to explain it but I know the answer
A. eres
Explanation: Eres mean “you are” B. means “We are” which makes no sense. C. es means “is” you is does not sound right in english either so it’s not C. and D. means “are” but it is used when it’s plural. :)
At the begging of each lesson is the introducción