For the base-induced loss of water from $\mathrm{HOCH}{}_2\mathrm{CH}{}_2\mathrm{Y}$, the ease of E1cB elimination follows the acidity of the alpha C-H of $\mathrm{CH}{}_3\mathrm{Y}$ (typical pKa values: ketone about 19, ester about 25, amide about 30, alkane about 50). The decreasing order of ease of elimination for $\mathrm{Y}=$ (a) $\mathrm{COCH}{}_3$, (b) $\mathrm{COOC}{}_2\mathrm{H}{}_5$, (c) $\mathrm{CONH}{}_2$, (d) $\mathrm{CH}{}_3$ is

1. Ab > a > c > d
2. Ba > c > b > d
3. Cd > c > b > a
4. Da > b > c > d