(a) The model below represents a star orbited by two planets- Planet A and Planet B. The star is also orbited by a mysterious object, Object X, which entered into the sta’s gravitational field. The star is the most massive object, followed by Planet B, Planet A and Object X. Use the model to answer the following question.
In the model above, how is the mass of the objects represented?

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(A) The mass is represented by the size of the objects

(B) The mass is represented by the distance of the objects

(C) The mass is represented by color of the objects

(D) the mass is not represented