Answer:
D) Make two similar size pinch pots and join them together by smoothing out the seam
Step-by-step explanation:
Typical technique for making hollow spheres or other round shapes.
Helpful video that clearly describes the steps for a perfect blend:
Since I can't add it as a link, look up "How to Combine Two Pinch Pots to Make a Round Hollow Form" and click the first video.