which most likely is a causal relationship?\no an experimenter showed different causes for two patients lung…

Brief Explanations:

A causal relationship implies that one factor causes another. Obesity is a well - known risk factor for adult - onset diabetes, suggesting a cause - effect link. Showing different causes for two patients' lung cancer is about individual causes rather than a general causal relationship. Claiming all cancers can be cured by a new drug is an over - statement and not about a causal relationship. Statistical data on diabetes drugs is about the drugs themselves, not a causal relationship between two conditions.

Answer:

Experimenters show a link between adult - onset diabetes and obesity.