Concept:Agricultural development is mainly achieved through practices that improve productivity and reduce losses.
Explanation:Growing disease-resistant crops helps prevent crop failure and leads to higher farm yields.
Such crops reduce the need for frequent chemical treatments and lower production risks.
Late-maturing crop varieties delay returns and expose crops to more field hazards.
Banning the importation of pesticides may limit effective pest and disease control.
Encouraging a communal land tenure system often discourages long-term investment in farmland.
Thus, among the given options, only disease-resistant crop farming clearly supports agricultural development.
Answer:A. growing disease-resistant crops