I'm not 100% sure about the first one but I think it is B. a los. Question 2, the answer is 3) a los. Last one, The answer is 4) juegan. Hope this helps!
B. les fascinan
Les because it is plural (my brothers). And fasciNAN because that is the correct conjugation for 'they'.
Ellos
cuz it’s plural (2 ppl) and then it’s a guy and a girl so it’ll go with the masc pronoun so ellos
El tren means the train in spanish.
