La maestra de educación física (entregar) el examen.
entregas
entrega
entregamos
entregan

The correct answer is option b. entrega.

So, the phrase is: La maestra de educación física entrega el examen.

Explanation:

In Spanish, for the sentence to be coherent, the subject and the verb have to agree in grammatical number and person. In this case, the subject is The Physical Education Teacher ("La maestra de educación física"), which indicates a singular third person (he/she), so the correct answer is option b. entrega, for it is a conjugation of the Spanish verb "entregar" also in the singular third person (he/she), which matches the subject accurately.

Option a. entregas is also singular but the conjugation is for the second person (you), not the third (she/he). Option d. entregan is also in the third person (he/she) but in the plural form, not singular. And option c. entregamos is not in singular nor third person conjugation, but in the plural first person.

usualmente me lavo los dientes antes de acostarme pero ayer no me lavé.  

usualmente hago mis tareas a las 15: 00pm pero ayer las hice a las 20 pm.  

usualmente llego a mi casa a las siete pero ayer volví a las nueve  

usualmente cocino arroz pero ayer cociné fideos.  

usualmente llamo a mi hermano al mediodía pero ayer lo llamé en la noche