The block absorbs all blue light. The block bends (refracts) all blue light. Only blue light is reflected by the block. Only blue light passes through the block.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What causes a blue block to appear blue in the sunlight?
Possibilities:
- The block absorbs all blue light.
- The block bends (refracts) all blue light.
- Only blue light is reflected by the block.
- Only blue light passes through the block.

Only blue light is reflected by the block.