Which Opinion Best Describes the Ease/difficulty of Converting from One

Multiple Choice

Which opinion best describes the ease/difficulty of converting from one unit of measure to another in the metric measurement system.

A) "The real disadvantage of using the metric measurement system is the difficulty of conversion from one unit of measurement to another."
B) "The real advantage of using the United States system is the difficulty of conversion from one unit of measurement to another."
C) "The real advantage of using the metric measurement system is the simplicity of conversion from one unit of measurement to another."
D) "The real advantage of using the United States system is the impossibility of conversion from one unit of measurement to another."
E) "The real disadvantage of using the United States system is the impossibility of conversion from one unit of measurement to another."