Which choice best describes the following sentence?

cassidy volunteered.

it is a complete and correct sentence.
it is a fragment that is missing a subject.
it is a fragment that is missing a predicate.
it is a fragment with a subject and verb but expresses an incomplete thought.

It is a complete sentence, so it is A. This is because there is a subject, And a predicate in this sentence.

Step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.