From the options, The planets in the solar system were formed by ( A ) ; The remaining materials from the sun's formation clumped together due to gravity.
The formation of the planets in the solar system are believed to have started off the same the way from the remains of the formation of the stars. it was originally believed that the formation of planets was from the solar nebula, but a more descriptive formation of the planets is through a process of accretion ( gradual cohesion of materials/matter from larger bodies like the sun to form the planets under the influence of gravitation )
Hence we can conclude that the planets in the solar system were formed by the remaining materials from the sun's formation clumped together due to gravity
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