How do you do this what is the answer

Multiplying an even number of negative numbers gives an answer that is choose from:

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Find the distance between (0,5) & (-4,2)