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An equinox occurs when

Aneither end of Earth’s axis is tilted toward or away from the sun.
Bthe north end of Earth’s axis is tilted away from the sun.
Cthe north end of Earth’s axis is tilted toward the sun.
DEarth’s axis is parallel to the sun’s rays.

Verified Answer :

A! Good luck on your test!

Answer: The correct answer is Option a.

Explanation:

An equinox is defined as an event that occurs when Sun's rays fall on the equator at noon and at an angle of 90°.

The axis of rotation of Earth must be perpendicular to the Sun's rays for this event to occur.

If the axis is titled to some angle even, then equinox will not occur.

Hence, the correct answer is Option a.

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