Solution
The passage argues that gender imbalance in eye care exists because women face systemic barriers (restricted mobility, delayed interventions, limited access) that prevent them from receiving timely treatment.
Option 1 -> Addresses only one specific activity (water collection) among many responsibilities mentioned. Cleaning and caregiving would still expose women to health risks. This weakens just a small part of the argument.
Option 2 -> Actually supports the passage by confirming that women's involvement improves health outcomes. This strengthens rather than weakens the claims.
Option 3 -> Contradicts the statistical claim about more than half of blind adults being women. While this challenges one data point, the passage's broader argument about access barriers would still stand.
Option 4 -> Directly contradicts the central premise of the entire passage. The passage's main argument is that gender imbalance persists because women face additional barriers—restricted mobility, delayed interventions, limited access to care. If no such barriers exist, the foundation for explaining why the imbalance occurs collapses entirely.
Hence, Option 4 -> If women face no additional barriers to accessing treatment, the passage's entire explanation for gender imbalance (systemic access issues, delayed care, restricted mobility) becomes invalid -> correct