Final answer:
The best Spanish word to complete the sentence is "comprendieron" and it means "they understood" in English.
Step-by-step explanation:
The best Spanish word to complete the sentence is comprendieron.
"Comprendieron" is the correct form of the verb "comprender" in the third person plural, which agrees with the subject "los estudiantes" (the students). It means "they understood" in English.
An example sentence using the correct word would be: "Los estudiantes comprendieron la lección." (The students understood the lesson.)
Learn more about Spanish