Final Answer:
After casting their Ability, Arcanists' next attack deals bonus magic damage equal to 225. Option 1 is the answer.
Step-by-step explanation:
In this context, the question refers to a game or fictional scenario involving Arcanists. The Ability of Arcanists triggers a bonus magic damage effect on their next attack. The correct value for this bonus magic damage is specified in option 1, which is 225.
This means that after casting their Ability, the Arcanists will have their next attack enhanced with an additional 225 points of magic damage. The other options, 2) 200, 3) 1/5/22, and 4) 12/8/21, do not match the specified amount of bonus magic damage as outlined in the question.
Option 1 is the answer.