For whom did Marie-Louise-Élisabeth Vigée-Lebrun serve as an official portraitist?

Overtones are inaudible to the human ear.

Answer the following statement true (T) or false (F)

The Greek philosopher ________ tried to demonstrate the order of nature by observing geometric and numeric proportion.

A. Socrates B. Euripides C. Agamemnon D. Pythagoras