In the Case of Aetna Health Inc

In the case of Aetna Health Inc. v. Davila , what was the basis of the plaintiffs' suit?

A) They sued their managed care plans under state law for negligent health care treatment decisions.
B) They sued their managed care plans under Section 502 of ERISA for denial of benefits.
C) They sued their physicians for breach of their fiduciary obligations under ERISA.
D) They sued their physicians under state law for failure to submit denial of their claims to an independent review organization.