A Researcher Interviews the Mayors of Nine Canadian Cities

A researcher interviews the mayors of nine Canadian cities. She wants to determine whether size of the city (small, medium, or large) is associated with its mayor's assessment of clinic availability (unsuitable, acceptable, excellent) .
-Refer to the scenario. Which of the following would be an ideal measure of association to calculate if the researcher re-did the study with 100 cities, and decided to measure size of city with five categories (very large, large, medium, small, very small) rather than three?

A) Kendall's tau-b
B) Kendall's tau-c
C) Cramer's V
D) phi