See solar terms in the northern hemisphere

When the earth revolves around the sun, the axis of the earth and the orbital plane form a fixed inclination of 66.5, which makes the direct point of the sun's rays move regularly between the tropic of cancer in a year.

According to the chart, the extreme day phenomenon appears in the Arctic Circle, indicating that the direct point of the sun at this time is on the Tropic of Cancer, which is the summer solstice in the northern hemisphere; Combination options.

Therefore, choose: B.