Read the following excerpt from a US court opinion:
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issue of fact that the denial of ice demonstrated “deliberate ind ed by the refusal to give him ice. He claims that he suffered severe dehydration; an unrelenting pounding in his head brought on by migraine headaches; and a burning sensation in his throat, chest, and stomach. Thus, Plaintiff offered sufficient evidence to raise a genuine issue of material fact as to whether Defendants were deliberately indifferent to his serious medical needs. The district court erred by granting summary judgment to Defendants on this claim. B. Retaliation. Plaintiff failed to introduce evidence raising a genuine issue of material fact as to whether he was sanctioned for exercising his constitutional rights to file an administrative complaint. See Pratt v. Rowland, 65 F.3d 802, 806-07 (9th Cir. 1995) . The administrative complaint that Plaintiff
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What is the most suitable continuation to the opinion? Your options are:
A. holding that a plaintiff must demonstrate a direct causal link between the municipal action and the deprivation of federal rights
B. holding that plaintiff cannot be the only link between the defendant and the forum
C. holding that to prevail on a  1983 retaliation claim a prisoner must submit evidence establishing a link between the prisoners exercise of constitutional rights and the alleged retaliatory action
D. holding that a prima facie case of retaliation requires a causal link between the employees protected activity and the employers adverse employment action
E. holding that to prevail on a  1983 claim a plaintiff must allege that the defendant acted under color of state law in other words that there was state action
Reply with [A, B, C, D, E] only.