Which of the following statements best conveys the genetic rationale for this situation?

A group of researchers has identified that the prevalence of two particular genetic disorders share a statistical correlation. Which of the following statements best conveys the genetic rationale for this situation?
There is likely a cause-and-effect relationship between the two genes responsible.
The chromosomes containing each gene are likely closely situated.
The genes causing each disorder are likely in the same section of the same chromosome.
The disorders likely share the same locus.