The most costly logistics activity in many firms is__. a. industrial packaging. b. warehousing management. c. order management.

d. transportation management

I am also going with b) warehousing management ..... a warehousing manager does much more than just managing inventory ...and most Log managers have transportation managers under them

Between b. warehousing management and  d. transportation management

I would chose

d. transportation management

D --- WARE HOUSE MANAGEMENT ALONG WITH HEAVY FLEET AND EQUIPMENTS management which would be definitely creating more costly logistics in most of the firms 

Depends on the complexity of operations.

Answer will be option b. warehousing management <<<<<<<<<<<<<<<<<