On the hike throught the forest, not only all the Girl Scouts but also Mrs. Pennington, the troop leader, looked up in surprise as a giant spaceship descended from the sky and hovered above _____.

? her head
? their heads

1 answer

The correct option would be "her head."

So the complete sentence would read: "On the hike through the forest, not only all the Girl Scouts but also Mrs. Pennington, the troop leader, looked up in surprise as a giant spaceship descended from the sky and hovered above her head."

This is because "Mrs. Pennington" is the antecedent closest to the verb "hovered," and it is singular.