The given data shows the number of mobiles (in thousands) manufactured by companies C-1, C-2, C-3 and C-4 in 2017, 2018 and 2019.

Which company manufactured the highest number of mobiles across all the years?

C-3

Manufacturing of mobile in C1 over all years = 59 + 65 + 68 = 192

Manufacturing of mobile in C2 over all years = 62 + 67 + 72 = 201

Manufacturing of mobile in C3 over all years = 68 + 71 + 74 = 213

Manufacturing of mobile in C4 over all years = 59 + 62 + 65 = 186

So , Highest number of manufacturing of mobile is of C-3 .