Step 1: Check statement I against the definition of biopiracy.
Biopiracy means an outside party exploiting a country's biological resources without fair compensation, not simply supplying useful industrial products, so statement I is mismatched and false.
Step 2: Check statement II.
Using plants as living factories to make medicines, chemicals or antibiotics is exactly what molecular farming means, so II is correct.
Step 3: Check statement III.
Boosting food output while cutting down on chemical fertiliser and pesticide use is the essence of the gene revolution, so III is correct.
Step 4: Check statement IV.
New genes moving into wild relatives through natural cross-pollination is textbook gene pollution, so IV is correct too.
Final answer: Option 4, II, III and IV.