Answer:
The answer would be C
Explanation:
Senoras y senores,<u>sientense, </u>por favor.
The difference is that you would say sientate, to someone the same age as you. But, with an adult, you say sientense.
Hope this helps
1. b. you use queria because if you say "quise" it means you stopped wanting to learn ballet sometime in the past.
2. b. you use conoci' because you've already met the professor in the past
Estas : estoy ...............