Rebecca placed an uncharged object next to an electrically charged object, and they were attracted to each other. She moved the charged object and placed it next to another uncharged object, and they were attracted to each other. What is the best explanation as to why this happened? The charged object kept its charge.
The charged object lost its charge.
The second object had a stronger charge.
The second object had a weaker charge.

According to Newton's Third law, For every action there is an equal and opposite reaction and, the action and reaction acts on different body, not on the same body.

Now, as the air is forced out of the balloon (action force), the balloon moves forward in the opposite direction (reaction force). Both forces are equal in magnitude and opposite in the direction.

Hence, the statement 2 is correct: According to Newton's third law of motion, the balloon is pushed forward as the air is forced out.