Two Helium-Filled Balloons Are Released Simultaneously at Points a and B

Two helium-filled balloons are released simultaneously at points A and B on the x axis in an earth-based reference frame. Which one of the following statements is true for an observer moving in the +x direction?

A) The observer always sees the balloons released simultaneously.
B) The observer could see either balloon released first depending on her speed and the distance between A and B.
C) The observer sees balloon A released before balloon B.
D) The observer sees balloon B released before balloon A.
E) The observer cannot determine whether they were released separately or simultaneously.

Correct Answer:

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