The reason for this can be attributed to two factors: 1) it takes Uranus 84 years to circle the Sun (so for half of the time the Poles are not exposed to the Sun while they are constantly exposed to the Sun for the remaining 42 years).
Uranus is the planet that experiences constant daylight or darkness for 42 years at its poles. The correct option among all the options that are given in the question is the first option or option "a". In case of the planet Uranus, the axis of rotation has been tilted by 98 degrees to its orbital plane and this why this unusual circumstances occur here.<span />
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