Explaining color mediums
Step 1: Transparency in art mediums refers to the ability to see underlying layers or surfaces through the applied color.
Evaluating mediums
Step 2: Analyze the mediums:
- Poster colour: Opaque, designed for bold, solid coverage.
- Water colour: Transparent, allowing layering and light to show through.
- Pastel colour: Opaque, as pastels are dense and chalky.
- Oil colour: Generally opaque, though can be thinned for translucency.
Confirming the answer
Step 3: Water colour is the most transparent medium among the options.
Thus, the correct answer is (B).