Which answer would score higher? Not sure where to start? Explain this Answer A Recruit volunteers from one hospital ward, record whether each has severe physical illness and diagnosed depression, then compare depression frequency between groups. A difference would show an association, not prove that physical illness caused depression. Answer B Randomly select adults from across the town, record whether each has severe physical illness and diagnosed depression, then compare depression frequency between groups. A difference would show an association, not prove that physical illness caused depression.