Total number of units sold by company A over the years = 110 + 118 + 143 + 126 + 152 + 195 = 844
Total number of units sold by company C over the years =103 + 153 + 100 + 128 + 96 + 56 = 636
Total number of units sold by company D over the years = 112 + 166 + 78 + 83 + 135 + 198 = 772
Total number of units sold by company E over the years = 72 + 169 + 154 + 98 + 140 + 192 = 825
Hence, company A has sold the maximum number of units over the years.
