Final answer:
Corn with increased resistance to pests could be produced by artificial selection, where humans select for and breed plants with desirable traits to enhance agricultural productivity.
Step-by-step explanation:
The organism that could be produced by artificial selection is a. Corn with increased resistance to pests. Artificial selection is a process where humans select and breed individuals from a population with desirable traits to produce offspring that express those traits. This method has been used to enhance agricultural crops and livestock. The other options b, c, and d involve natural habitats or laboratory settings where natural selection would be the prevailing evolutionary force, not artificial selection.
In the case of corn, humans can choose plants that show increased resistance to pests and breed them selectively to produce more corn with the same trait. Over time, with continued selective breeding, a corn variety with significantly improved pest resistance can be developed. This process exemplifies artificial selection, as it requires human intervention and deliberate choice in the breeding process.