Respuesta:
Doesn't es únicamente para terceras personas (he, she, It) don't para el resto.
Mark doesn't like salad (porque es he)
Bella doesn't eat watermelon (porque es she)
Mark and I don't drink tea (porque es they)
My mother doesn't drink wine (porque es she)
David and Phillip don't like peas (porque son they)
I don't eat lettuce (es I)
Para la B) sigue la estructura
Sujeto + don't/doesn't + verbo + complemento de la oración
I don't eat oranges.
Kate doesn't like butter.
