[tex]\huge \bf༆ Answer ༄[/tex]
Let's use Unitary method to solve the question ~
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:4 \: mm \rightarrow20 \: miles[/tex]
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:1 \: mm \rightarrow(20 \div 4) \: miles[/tex]
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:1 \: mm \rightarrow5 \: miles[/tex]
Therefore, 1 mm corresponds to 5 mile according to the map.
so, correct choice is ~
[tex]\overbrace{ \underbrace{\underline{ \boxed{ \sf A }}}}[/tex]
