Artists use shadows, contrast, and size difference to give depth. If a floral artist were to use these tricks to convey depth in art, they would want flowers or whatever greenery is added to the piece that is in the background to be darker and larger, and the flowers closer to the viewer to be smaller and brighter. Use lighting to convey distance!!
The correct answer to
fill the space is option "B".<span>
Full sentence will be as follow:
"Post and lintel" is the simplest and oldest method of spanning a passageway.
In prehistoric times two upright blocks were put to serve as posts
and a horizontal beam was put on that.</span>
It seems you need to read the passage. Sorry but please include a text.