Final answer:
For 215μl, a P200 micropipette is the correct choice as it's designed for the 20-200μl range.
Step-by-step explanation:
To deliver a volume of 215μl, the appropriate pipette to use would be option B) P200. A P200 micropipette is designed to accurately dispense volumes ranging from 20-200 μl. Since 215μl is within this range, it is the suitable choice over the P1000, which is too large, and the P20 and P100, which are too small for this volume.