Nosotros no el número de teléfono de maria. a. saben c. conocemos b. sabemos d. conocen

The correc answer is: b. sabemos  - Nosotros no sabemos el número de teléfono de María.

By discarding the given options:

a. saben: Incorrect, it's referring to the action of knowing something for two or more people, it's a conjugation for the third plural person (they/ellos).

b. sabemos: Correct, it's referring to the action of knowing something for two or more people, it's a conjugation for the first plural person (we/nosotros).

c. conocemos: Incorrect, it's referring to the action of knowing something for two or more people, it's a conjugation of a different verb (conocer)for the first plural person (we/nosotros).

d. conocen: Incorrect, it's referring to the action of knowing something for two or more people, it's a conjugation of a different verb (conocer) for the third plural person (they/ellos).

In English the verbs "conocer" and "saber" can be written using the same word "know" and its meaning will depend on the context.

In Spanish the verbs "conocer" and "saber" are synonymous but they can mean a notorious difference depending on the context, so, the verb that we should use for this statement is "saber".

Have a nice day!