Is There a Relationship Between Rugby Players' Ability to Score

Is there a relationship between rugby players' ability to score a goal and their height? The International Rugby Board is investigating whether there are any differences in the average rankings for number of goals scored by tall and short players in a season.What is the research hypothesis for this Mann-Whitney U test?

A) Tall rugby players and short rugby players do not differ in average scores per season.
B) Tall rugby players and short rugby players differ in average scores per season.
C) Tall rugby players have a higher number of scores per season than do short rugby players.
D) Short rugby players have a higher number of scores per season than do tall rugby players.