Which of these galaxies can be shaped as a single spiral arm?

The most common type of galaxy found throughout the universe is the spiral galaxy. Around 77% of the galaxies observed by man are spiral galaxies. A good example of this type is the Andromeda galaxy. Around two-thirds of all spiral galaxies have a bar-like structure – thus they are classified as barred spiral galaxies. The file attached shows how to figure out weather its a spiral galaxy or not.

The answer must be c

Iam guessing it’s a metallic because it is powdery and so belongs to group 2it is also light. so i would guess it’s graphite.if available, additional information would be very for-example its color. if black it would be division e. also try to mark it on a paper.