Hi there!
The answer is D.
As in "realistically proportioned", it means if you were to stand in a position next to the object or person, it would be how you see things. In this case, the answer would be at the foot level of a person.
Hope this helps!
The concerto was a popular form during the Classical period (roughly 1750-1800). It had three movements – the two fast outer movements and a slow lyrical middle movement. The Classical concerto introduced the cadenza, a brilliant dramatic solo passage where the soloist plays and the orchestra pauses and remains silent.