An important feature of supply chain management is its application of electronic commerce technology that allows companies to share & operate system

Definitely A is the answer.. Its cover all the supply chain process in internal department.

Best  answer choice  of this question is Option -A .

But other options are also good in certain point view...

Option A. 

You can check answers to all your questions in the following link related to the McGraw-Hill Ryerson book on Marketing -4th Canadian Edition 

http://iimtmanagementcollege.blogspot.com/2009/12/supply-chain-management-multiple-choice.html

A. order processing, transportation scheduling, and inventory management.>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The complete answer to the question is A.

however the other options may be considered as important feature is certain cases

A.>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The answer would the option A in the list provided.....

A. order processing, transportation scheduling, and inventory management.

Appropriate the correct answer to that is choice A

option A is the right answer. Supply chain management is associated with ordering, transportation & processing.

Choice No.-------------------A

Thanks