What is the principal part of the underlined verb in the sentence?

bobby has taught me how to cook spaghetti with meatballs.

a.
present participle

b.
past participle

c.
present

d.
past

"get off of your lazy bum and come running with me or i'm dumping this pitcher of water on u " u say with a smile. she thinks your joking so she ignores you about 10 seconds later shes screaming wile water is dripping everywhere you say "here comes the second one! " then you here her say okay, your such a j e r k ! ill be ready in 5 put the pitcher down " she say in an angry tone. and you smile in victory

good enough?

a: it is sound because it cites an expert’s opinion.