"Went" and "met" are both in the simple past tense, which is used to describe actions that happened at a specific point in the past. This makes them the appropriate choice for this sentence, as it refers to events that have already occurred.
The simple past tense is used for actions that are completed in the past, which fits the context of the sentence. For example, "went" refers to the action of going that happened previously, and "met" refers to the action of meeting that also took place in the past.
The other options either use the present tense, which is used for actions happening now, or the continuous tense, which is used for actions that are ongoing. These are incorrect because the sentence is talking about completed past events.
The correct choice is the use of simple past tense ("went" and "met") because it accurately describes actions that took place in the past.