The prefixes are a group of letters or one single letter placed and attached before the root word, and at the same time provides meaning to the complete word. For example "impossible" in this case the prefix would be "im".
Hence, the correct answer is letter <u>c. ex</u>
Is A - the flashcards - you can use them in any place and you can learn much more easier
* Nosotras vamos a asistir a clase hoy.
(asistir a is its own word and has its own 'a')
what you were doing is "ir + infinitive" lol