Correct Answer: B
Explanation:
“Sunspots . . . tend to occur in pairs.” Choices (A) and (C) refer to possibilities for arrangements, but not to the configuration in which sunspots usually occur. Choice (D) is not mentioned in the range of numbers for sunspots, form one to more than one hundred. The number one thousand refers to the number of years sunspots have been recorded, not to the number in a configuration.