Mars Rovers (Such as Opportunity and Curiosity) Have Identified Evidence

Mars rovers (such as Opportunity and Curiosity) have identified evidence that their landing sites were once under water. Which of the following is among the kinds of evidence they have identified?

A) they found liquid water deposits just under the surface when they dug down a few feet
B) they found rock formations that show the area was under water and also minerals that only form in water
C) they found warm salt water spurting up in the form of geysers
D) they found a lot of water vapor in the martian atmosphere just above their landing sites
E) they found buried ropes and buoys from ancient martian swimming holes