I believe the answer is: C. Decoration
In fashion, decoration refers to the external elements that added to the cloths in order to make it look more attractive.
In Victorian female Fashion for example, we could see the decoration resided mostly on the knee level to the chest level of the clothing.
The center of the Roman Empire is in Italy. ROME. And to be specific,
there was a spot in the forum called the "umbilicus urbis Romae" which
is translated "the center of the city of Rome" or "the navel of Rome".
At any rate, it was the spot from which all distances, from all over the
empire, were measured.
Space Sequence
A museum tour guide is most likely to use a space sequence.
