Among the following solar terms, () A. Winter solstice B. Summer solstice C. Vernal equinox D. Autumn occurs in the Arctic.

Every year around June 22nd, the sun shines directly on the Tropic of Cancer, which is called the summer solstice in the northern hemisphere. Six months, seven months and eight months before and after the summer solstice are the summers in the northern hemisphere. The farther north the summer days are, the more extreme days will appear in the Arctic. Therefore, option b meets the meaning of the question; Options a, c and d don't meet the meaning of the question.

Therefore, choose: B.