The C major key, starting with the middle C, consists of seven notes (white keys on the piano) with the following frequencies.

Note
C
D
E
F
G
A
B
Frequency(Hz)
261.6
293.7
329.6
349.2
392.0
440.0
493.9

Determine the ratio of the note A to middle C.
a.
1.6818
c.
1.5348
b.
1.4983
d.
1.3654