Answer:
A. comprenden
Step-by-step explanation:
Let's first translate this sentence:
"Los estudiantes" refers to "the students"
"la leccion" refers to "the lecture"
So, we want to find a relationship between the students and the lecture.
We need to see which answer choice will make the most sense here. Examine each one:
A) "Comprenden" comes from "comprender" which means "to comprehend/understand"; well, that makes sense here if the students understand the lecture, so keep this.
B) "Beben" comes from "beber" which means "to drink"; that doesn't make any sense here: students don't drink a lecture.
C) "Leen" comes from "leer" which means "to read"; while sometimes, it's true that you can read a lecture, usually lectures are in spoken form, so comprehending the lecture (choice A) makes more sense than C.
D) "Hacen" comes from "hacer" which means "to do"; that doesn't make sense here, either, because students don't "do" a lecture.
Thus, the answer is A.