I'd have to say c but you've got the letters mixed up, so to be safe it's because they often represented animals. The sphinx for example represented Horemakhet, a god who Thutmosis IV 'dreamt' about to become pharaoh.
The answer is D) rhythm.
During the Ars Antiqua, music theory made great strides. One of the most important innovations from this time was the devlopment of a notation, or written representation in sheet music, of rhythm. Rhythm is naturally a very important element of music, and being able to represent the rhythm of a song in written form made it much easier to play it accurately without having heard it.
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