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I want to say the answer your looking for is option C. But not 100% sure.
Answer:
Image result for What was the "Three Field System" and how did it revolutionize European agriculture?
The three-field system let farmers plant more crops and therefore increase production. ... Crop assignments were rotated every year, so each field segment would be planted for two out of every three years. Previously a "two field system" had been in place, with half the land being left fallow.
Explanation:
Answer:
the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about June 21 and December 22).