What does pointing mean on the fifteenth day after the vernal equinox?

"Almanac" said: "On the fifteenth day after the vernal equinox, the bucket refers to Ding, for Ming, when everything is clean and clear, when it is covered, everything is clean and clear, hence the name." Agricultural proverb: "Before and after Qingming Festival, point melons and plant beans." "Qingming" as a solar term in materials is mainly because

A. ancestor worship and grave sweeping B. outing C. agricultural production D. political clarity

C

Test and analysis: The Cold Food Festival is held from winter to the future 105, around Tomb-Sweeping Day. Because two days are almost the same, Tomb-Sweeping Day and cold food are merged into one day. According to the lunar calendar in Tomb-Sweeping Day, last year's winter solstice passed 106 days, Tomb-Sweeping Day arrived, and the temperature rose, which is a good season for spring ploughing and planting. Therefore, there is an agricultural proverb, "Before and after Qingming Festival, plant melons and beans" and "Planting trees is not as good as Tomb-Sweeping Day". Judging from this, "Qingming" is mainly agricultural production.