Please help!

Which of the following is an example of a scale on a map?

A. 1:12,000
B. Contour interval: 50 ft
C. an arrow pointing north
D. an explanation of the symbols used

https://www.ga.gov.au/scientific-topics/national-location-information/topographic-maps-data/basics/what-is-map-scale

... so C is out.

Read that carefully and let us know what you decide.