Which most likely is a causal relationship?
a. an experimenter showed different causes for two patients’ lung cancer.
b. one experiment showed that all cancers can be cured by a new drug.
c. experimenters show a link between adult-onset diabetes and obesity.
d. experimenters show statistical data on diabetes drugs.

Obesity and adult onset diabetes share a causal relationship.

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

Explanation:

When one event causes another event, the events are said to have a causal relationship. Obesity is a strong cause of adult onset diabetes.  Blood-sugar levels in people having this medical condition are very high.

In a causal relationship the events have a cause-effect relation. One event will be the cause and other will be the effect. Increase in rain and increase in water level of dams share a causal relationship. Here increased rain is the cause and water rise in dams is the effect.

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