Read the following excerpt from a US court opinion:
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sovereign immunity. C. The Public Vessels Act, Suits in Admiralty Act, and Federal Tort Claims Act Each of these three Acts provides an explicit waiver of sovereign immunity. The PVA waives sovereign immunity for suits for “damages caused by a public vessel of the United States.” 46 U.S.C. § 31102(a)(1). But the PVA contains a reciprocity requirement: A national of a foreign country may sue under the PVA only if the government of that foreign country would permit a United States national to bring the same suit in its courts. Id. § 31111. The SAA waives sovereign immunity, subject to some exceptions, in admiralty cases when a civil action could otherwise be brought if the United States were not a party. Id. § 30903(a); see Earles v. United States, 935 F.2d 1028, 1032 (9th Cir.1991) . Finally, the FTCA waives sovereign immunity
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What is the most suitable continuation to the opinion? Your options are:
A. holding that an agent acting outside his delegated authority is not protected by the discretionary function exception
B. recognizing a discretionary function exception to that waiver
C. holding that the discretionary function exception may apply in the absence of a conscious decision 
D. holding federal tort claims act discretionary function exception does not apply if prison personnel violate a mandatory regulation
E. recognizing exception
Reply with [A, B, C, D, E] only.