Well designed instructions should select use of a layered approach for lengthy instructions and separate each step visually.
Option: D
Step-by-step explanation:
A well designed instruction implies an audio-visual effect which includes layered approach for lengthy instructions means writing of the whole things in proper segregation. And present each step with systematic presentation. Visual effect draws a significant place in the mind of a listener.
Well designed approach includes knit and cleanliness in presentation, transparency, symbolization, pointing and highlighting the useful points for better configuration and execution. This approach is more useful for attracting attention in presentation.