sAs and ssa, etc. means like side angle side or side side angle from looking from E to F so the one one the left is C) because you have...
acute, right angle, acute. which is ASA theorem aka angle side angle. This theorem goes hand and hand with SOH COH TOH which is sin over hypotenuse or cos or hypotenuse you know.
The 2nd one is congruent. You can tell because that little 1/4 circle cut off in both triangles tell you they are both equal and also both have an equal hypotenuse.
