These two poems vividly reflect the vertical climate in which the temperature in mountainous areas decreases with the elevation. Normally, the temperature drops by 0.6℃ for every elevation increase of 100 m. The elevation of Dalin Temple in Lushan Mountain is between1100-1200m, which is about 6℃ lower than that in Jiujiang City (with an average elevation of 32m). So the opening time of peach blossoms was delayed by 20-30 days, so the phenology on the mountain was delayed by about a month. So choose B.