Mis padres caminando en el parque.

a.

soy

c.

está

b.

son

d.

están

For this case, what we should do is fill in the blank space with the correct verb.

For this case the verb is:

Estar

The conjugation time is simple present.

The conjugation will do for the third person plural.

By completing the sentence with the established rules we have:

Mis padres están caminando en el parque.

The translation of the sentence in English is:

My parents are walking in the park.

"Están"

Mis padres están caminando en el parque.

well, i am responding 3 minutes into you posting. i assume 3 minutes?

nosotros = we   .     okay?