Amino acids	Distance travelled (cm)	${\mathrm{R}}_{\mathrm{f}}$values
A	$2.5$	$0.7$
B	$1.5$	$0.42$
C	$2.5$	$0.7$
D	$1.5$	$0.42$
E	$2.1$	$0.6$

Use the ${\mathrm{R}}_{\mathrm{f}}$table above to name the amino acids. (The Rf values of some amino acids are given)