Discussion
As we move away from the sun in the solar system,
Answer: A
As we move away from the Sun, the time taken by planets to complete one orbit around the Sun increases.
A planet farther out travels a longer path and moves more slowly along it, so its year is longer. Mercury takes about 88 days, the Earth 365 days, Jupiter about 12 years and Neptune about 165 years.
The other options are wrong. Option B states the reverse. Size does not decrease steadily: the giants Jupiter and Saturn lie beyond the small rocky planets. And option D reverses the actual arrangement: the inner planets close to the Sun, Mercury to Mars, are rocky, while the outer planets are giants made mostly of gases and liquids.
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