1. D. comen
Why by Mimiwhatsup: When changing things to Present Indicative in Ellos/Ellas/Ustedes form it is always going to end in for -er verbs at least - En. Translation by Mimiwhatsup: The boys eat at 8 o'clock.
2. Nosotros compartimos el arroz con leche.
Why by Mimiwhatsup: When changing things to Present Indicative in Nosotros form it will end in the imos this compartir is a -ir verb. Besides I don't think it wouldn't make sense to say 'I we cook the rice in milk.' So it has to be Nosotros.
3. B. comparten
Compartir should like like this in Indicative Form:
Yo: comparto
Tú: compartes
Ella/Ello/Usted: comparte
Nosotros: compartimos
Vosotros: compartís
Ellas/Ellos/Ustedes: comparten
