Read the following excerpt from the transcript of U.S. Supreme Court case, Sturgeon vs. Frost.

Justice Elena Kegan: Mr. Findley, can I as two quick clarifying questions just so I understand what’s at issue here?

Your argument applies to the navigable rivers generally; is that right? In other words to the navigable rivers running through federally owned land.

Mr. Findley: Yes, exactly.

Justice Sonia Sotomayor: You’re claiming that there’s no residual right to control navigable waters in the Federal lands area?

Use context clues or a dictionary to select the best definition for Justice Kagan’s and Justice Sotomayor’s use of navigable.

a deep and wide enough to provide passage to ships
b an ability to cross laterally
c a point of meeting
d ease and ability to crossed by persons or animals.