Final answer:
The correct forms of the verb 'ser' in order of appearance in the sentence are 'es/son'.
Step-by-step explanation:
The correct forms of the verb 'ser' in order of appearance in the sentence 'alta y rubia, pero mis abuelos. Mi madre' are 'es/son'. So, the correct option is B. 'es/son'.
Learn more about Verb forms in Spanish