Answer:
conjugation is very important in Spanish because verbs can change their form to match the subject of the sentence. For most verbs, there are six different form you could use depending on the subject the verb is paired with!
You can use quizlet Spanish flash cards to help, also Spanish britanica articles.
Hope this helped :)
The correct word to fill the blank and complete the sentence is letter A, obediente.
Un niño que siempre hace que dice su mamá es muy obediente.