Which of the following sentences contains an indefinite pronoun?

Question

A. Her car's battery died because she left the lights on.
B. The team congratulated one another on a job well done.
C. This is Mary's necklace.
D. The flowers, which were just planted, need watering.

Answer 1

Study this.

http://www.k12reader.com/indefinite-pronouns/

What do you think?

Answer 2

Which of the following sentences contains an indefinite pronoun?

A. This is Mary's necklace.

Answer 3

That's incorrect