Is your a subject or object pronoun?

What is the best revision of this statement from the body of a cover letter?

There are six red marbles 4 blue marbles and 15 green marbles in a jar if you reach in and randomly draw one what is the probability that it will choose a red marble

Which sentence has a correctly placed participial phrase? a. we read about a pizza on the menu covered in pepperoni. b. covered in pepperoni, we read about a pizza on the menu. c. we, covered in pepperoni, read about a pizza on the menu. d. we read about a pizza covered in pepperoni on the menu.