For the following reaction sequence (it is not necessary to understand the chemistry) what significant change(s) would be expected by IR (ignoring C-H absorptions)? A. A peak around 2250 cm-1 would disappear and nothing new would appear. B. A peak around 1720 cm-1 would disappear and a new peak around 3300 cm-1 would appear. C. A peak around 2250 cm-1 would disappear and a new peak around 1720 cm-1 would appear. D. A peak around 2250 cm-1 would disappear and a new peak around 3300 cm-1 would appear. E. No change would be observed.