What option should speed up the delivery while meeting these criteria?

Northern Trail Outfitters wants to have a periodic, dynamic newsletter send to a set data extension, but the data in this data extension will be regularly updated and the subscribers inside could be removed/added multiple times.

What option should speed up the delivery while meeting these criteria?
A . Journey that allows re-entry after exiting
B . Scheduled Automation utilizing Triggered Send Emails
C . Scheduled Automation using a Send Activity
D . Single Send Journey

Answer: C