To know the number of data points, simply count the number of values in the data, these values are separated by a comma
Option A: 18, 91, 93, 55, 57, 18. is not correct (it has 6 data points)
Option B: 25, 26, 28, 91, 18, is not correct ( it has 5 data points)
Option C: 9, 12, 8,5, 12, 9, 7. is correct (it has 7 data points)
Option D: 7,5, 9, 11, 13, 4, 9, 18. is not correct ( it has 8 data points)
Option E: 95, 91, 87, 99, 95, 84, 77. is correct (it has 7 data points)
Options C and E are correct