In each of the questions below, a word is given, followed by four statements. From the options, choose the one that provides the combination of statements that can be joined using the given word.

Because

A. Researchers say the advice related to the drug is premature and risky.

B. The task force says its latest decision is based on three new observational studies.

C. There is limited evidence that the drug, hydroxychloroquine, works against the new coronavirus.

D. It shows that the anti-malarial drug can prevent infection.