She meets a woman with a child while at the bar. When Taylor is about to leave the woman approaches her and gives her the child telling her not to turn to the bar before leaving. She stops at a motel and gives the baby a bath where she discovers the infant had injuries. It was during this time that Taylor found a purpose in her life.
The answer would be “The fiat system of currency was a great improvement over the commodity and representative systems of currency.” so the answer is (b.)

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.