Which is the correct substitute for the underlined words?

Question

Hablamos de los príncipes.( los príncipes is underlined).
A)éstas
B)éstos
C)están
D)éstan

El duque ama a la duquesa. ( la duquesa is underlined)
A)esta
B)estás
C)ésta
D)está

is it b and C ?

Answer 1

1. los tells you it is masculine plural. The choice must be B. A is feminine plural, C is a verb, D is an error.

2. la tells you feminine singular. The choice must be C. A is an adjective & you need a pronoun. B is a verb and D is also.

So you were correct!
Sra