SER:
Soy (your name).
Somos amigos.
Ella es tonta.
ESTAR:
Estoy en casa.
?Dondé estás?
Estoy feliz.
Answer:
Ok, we must choose the option where the conjugation is in the imperfect tense.
Now, is easy to see that the only option where the verb is conjugated in the preterite tense (usually this conjugation ends in -ía) is option B:
Las Hadas leían hechizos, where the verb is "leer", and when conjugated, it transforms from "le-er" to "Le-ían", so it is also irregular, then this is the correct option.
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