well not range that's for sure... Range is the difference between the lowest and highest values.
Mode is the number which appears most often in a set of numbers
mean is the average of the numbers
To find the Median, place the numbers you are given in value order and find the middle number
I'm guessing mode (C) Because Mode appears the most and if they were the most popular in the band in the 1960s then it only seems right. sorry though I'm not completely sure but I hope it helped