Step 1: Understand effects of globalization in India (post-1991).
Service industries (IT/ITeS, finance, telecom) integrated rapidly with global markets and grew fast; manufacturing gained moderately; agriculture faced price volatility and limited integration.
Step 2: Compare sectoral gains.
Service $\gg$ Manufacturing $>$ Agriculture in terms of benefits.
Step 3: Evaluate options.
Agriculture shows the least net benefit due to small landholdings, infrastructure gaps, and exposure to global price shocks.
Step 4: Conclusion.
Therefore, (A) Agriculture.