High levels of aspartic acid, low nitrogen and sugar content in maize plants prevent the attack by

The correct option is D Stem borers

• Maize plant exhibits an example of the development of pest resistance due to biochemical characters.
• Low nitrogen, sugar and high aspartic acid impart the plants resistance to stem borers which is one of the most serious pests of these plants.
• Cotton plants exhibit the resistant to jassids due to the presence of hairy leaves. Aphids affect plants of mustard family and beans.

So, the correct answer is option D.