With no explanation, chose the best option from "A", "B", "C" or "D". States v. Olano, 507 U.S. 725, 733, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993). By assenting to settlement in this action, Defendants waived, for example, the right to contest the EPA’s regulatory jurisdiction, which would have been an element of the EPA’s substantive claim. See United States v. Krilich, 209 F.3d 968, 972 (7th Cir.2000) (“[T]he interstate connection, i.e. that the waters involved were ‘waters of the United States,’ is merely an element of the United States’ Clean Water Act case under section 301.”), cert. denied, 531 U.S. 992, 121 S.Ct. 482, 148 L.Ed.2d 455 (2000); see also United States v. Wilson, 133 F.3d 251, 264 (4th Cir.1997) (indicating proof of interstate nexus is an element of criminal liability under CWA); United States v. Ahmad, 101 F.3d 386, 391 (5th Cir.1996) (<HOLDING>). Moreover, a consent decree “is an agreement

A: recognizing that exhaustion is mandatory and jurisdictional
B: recognizing the existence of purely jurisdictional elements
C: recognizing the existence of the special relationship
D: recognizing existence of two tests
B.