To find the correct option, let's analyze each statement based on NCERT biology:

• Statement (A) is Correct: Auxins are known to induce parthenocarpy (fruit formation without fertilization) in plants like tomatoes.
• Statement (B) is Correct: Plant Growth Regulators (PGRs) are divided into two groups: promoters (Auxins, Gibberellins, Cytokinins) and inhibitors (Abscisic acid, Ethylene).
• Statement (C) is Correct: In plants, differentiated cells can regain the power of division (dedifferentiation) to form a meristem, which then produces cells that differentiate again (redifferentiation).
• Statement (D) is Incorrect: Abscisic acid (ABA) is a growth inhibitor, not a promoter. It is involved in seed dormancy and closing of stomata.
• Statement (E) is Incorrect: Apical dominance inhibits the growth of lateral buds. It is the removal of shoot tips (decapitation) that promotes lateral bud growth.

Since A, B, and C are correct, the most appropriate option is (C).

PGRs are small, simple molecules of diverse chemical composition that control all phases of plant growth.

1. Growth Promoters vs. Inhibitors

• Promoters: Perform growth-promoting activities like cell division, cell enlargement, pattern formation, and flowering. (Example: Auxins, Gibberellins, Cytokinins).
• Inhibitors: Important for responses to wounds and stresses of biotic and abiotic origin. They induce dormancy and abscission. (Example: Abscisic Acid).
• Ethylene: A gaseous PGR that fits into both categories but is largely an inhibitor of growth activities.

2. Differentiation, Dedifferentiation, and Redifferentiation

Plants have unique flexibility in their development:

• Differentiation: Cells derived from root/shoot apical meristems mature to perform specific functions.
• Dedifferentiation: Mature cells regain the capacity to divide under certain conditions (e.g., formation of interfascicular cambium).
• Redifferentiation: Cells produced by dedifferentiated tissues lose their capacity to divide again and mature to perform specific tasks.

3. Apical Dominance

In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds. This phenomenon is caused by Auxins. Decapitation (removing the tip) allows lateral buds to grow, a practice used widely in tea plantations and hedge-making.