If total managerial wage bill is defined as the difference between total emoluments and total wage to workers, and total managerial staff is defined as the difference between total person engaged and total number of workers, then average managerial wage would be HIGHEST for:

Total managerial wage bill is defined as the difference between total emoluments and total wage to workers, and total managerial staff is defined as the difference between total person engaged and total number of workers.

Then average managerial wage would be  :  Total managerial wage bill/total managerial staff 

Average managerial wage = (total emoluments - total wage to workers)/( total person engaged - total number of workers)

Now calculate the average managerial wage for industry 3, 5, 6, and 7.

For industry 3: (6479 - 3706) lakhs/ (6830 - 5656) => 2773/1174 lakhs = 2.36 lakhs

For industry 5: (9284 - 5800) lakhs/ (9088 - 7508) => 3484/1580 lakhs = 2.20 lakhs

For industry 6: (6084 - 3117) lakhs / (4271 - 3333) => 2967/938 lakhs = 3.16 lakhs

For industry 7:(15053 - 6966) lakhs / (19159 - 15670) => 8087/3489 lakhs = 2.31 lakhs

Therefore, average managerial wage for industry 6 is maximum which is option B.