Which of the following sentences follows correct subject-verb agreement?

1. The beautiful bluebirds flies to the tree.
2. The girls are boarding their plane for the flight
3. She run fast, so they asked her to join the cross country team.
4. We gone to the store to get some groceries

The correct sentence that follows subject-verb agreement is:

2. The girls are boarding their plane for the flight.

The sentence that follows correct subject-verb agreement is:

2. The girls are boarding their plane for the flight.