Answer:
Choice C, Simple.
Explanation:
(sentence: Aliza found fragments of ancient pottery)
There are three tenses in english. There's Past, present, and future.
These show something being at a certain point in time, like,
"I was eating that in 1987 but then you stole it and fed it to the dog"
However, these can't always be clear as to a very specific point in time, like,
"I was eating that, until you stole it and fed it to the dog."
So, it's a simple verb, because it shows an action, but it isn't pinpointing a specific moment in time.
