"¿Tú lo comprendiste?"
Translation:Did you understand it?
Not necessarily Dug. If these sentences are used for Spanish to English users, it is not helpful to teach that the "easy option" comprehend is how English speakers express "comprender" - those learners would sound quite odd.
For a literal translation, Dugggg, you are correct. However, heavenknox's interpretation is an acceptable connotative translation.