According to the condensation theory, the most important factor for the formation of our planets was the gravitational pull of the sun the interstellar dust attracting heat away from the protosun the process of nuclear fusion the nebular cloud condensing

The correct answer to this question is "the process of nuclear fusion the nebular cloud condensing." According to the condensation theory, the most important factor for the formation of our planets was the process of nuclear fusion the nebular cloud condensing.

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