What Was the Symbolic Intent Behind the Placement of the Entrances

What was the symbolic intent behind the placement of the entrances to the Sainte-Chappelle chapel?

A) The royal family entered on the same level as the dramatic stained glass, which would mirror Louis' own eminence, while others had to enter the chapel on the ground level.
B) The lower level was constructed as support for the extraordinarily high arches of the upper level.
C) The chapel had been constructed as a secret place of worship for Cistercians in the thirteenth century so there was a hidden entrance.
D) The chapel was built on the donations of guilds and the height of all entrances had been determined by this patronage.