indicate or indicates

[Debra Kirk]

Evaluation of the patient's history, laboratory data, diagnostic tests, radiological studies, and treatment protocol ( indicates indicate ) little improvement in his overall condition.

Which word should I use and what is the rule? I chose indicates. Is that correct?

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[MikeNewYork]

Evaluation of the patient's history, laboratory data, diagnostic tests, radiological studies, and treatment protocol ( indicates indicate ) little improvement in his overall condition.

Which word should I use and what is the rule? I chose indicates. Is that correct?

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Evaluation is single, so the verb has to be indicates.