What is the most logical next event?

How to check the freshness of baking powder
Boil some tap water.
Use tap water and fill a kettle to the minimum fill line. You only need cup (118 ml) of hot water to test the baking powder, but filling the kettle to the minimum fill line will ensure the heating element doesn't overheat.

Pick from: (A). Turn on the kettle and bring the water to a boil. Don't use more water than you need, otherwise the kettle will waste energy heating the extra water. (B). Make sure you have warm, but not boiling, water. Place a baking sheet under the oven vent (the bottom of the oven). (C). This is also a good time to test the moisture content of the water in a fresh batch. Fill the kettle just a quarter full with water. (D). Sprinkle the baking powder into the water. Transfer the powdered glass directly into the boiling water.
(A).