Is the simplest and oldest method of spanning a passageway. a. wattle and daub b. post and lintel c. mortise and tenon d. corbel vaulting

The correct answer to fill the space is option "B".
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.

the correct answer for this question is:

it is system invented in 1872 that produced the first illusion of movement. basically it was a disk with a series of drawings around the edge, showing the same object in slightly different poses. when it was spun, it created the illusion of movement.

found this online : )