Answer:
The correct answer is "Statistical Hypothesis".
Explanation:
Given the example, the breeder wants to find the relationship between the two variables which are the effects of bredding and the face length of the boxer breed. He/She is using the statistics of the face length from the years 1915 and 2015 so the type of hypothesis that should be used is "Statistical Hypothesis" which is used when the hypothesis can be verified statistically. I hope this answer helps.