Northern Trail Outfitters (NTO) is currently sending out a single welcome email when a subscriber joins its myNTO Reward

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Northern Trail Outfitters (NTO) is currently sending out a single welcome email when a subscriber joins its myNTO Rewards program. NTO wants to test whether one, two, or three welcome emails would result in a higher rate of conversion.
How can this be accomplished most efficiently?

A. Automation Studio with three separate Welcome automations.
B. A series of A/׀’ tests to determine the number of emails.
C. Journey Builder using a Random Split with three branches.
D. Journey Builder using a Decision Split with three branches.