Scheduling is the process by which decisions are made concerning?

Many thanks

the answer is - Option B.

Best Regards.

Thank you for the invitation

i agree the option B

Mr.Muhammad is right , scheduling concerns itself with as mentioned in option B - Tasks & Timings of the tasks to be accomplished .

Option D. Time when the tasks are to be completed

In my opinion

B. Both1)Tasks to be accomplished and2) Time when the tasks are to be completed.

Thank you for the invitation

Thanks for the information 

I Agree Option B

Thanks, my answer is option D

Thank you option D is good answer.