Answer: (c) Only three statements
Statement 1 is correct as DM increases the risk of developing respiratory infections.
Statement 2 is correct as DM delays the healing process of TB by prolonging sputum smear and culture conversion.
Statement 3 is correct as TB patients with DM have lower lung functioning after completing treatment compared to TB patients without DM.
Statement 4 is incorrect as DM does have an impact on TB treatment outcomes, increasing the likelihood of unfavorable outcomes.