Fruit drop in chili can be overcome by spraying:

Correct option is B

NAA (Naphthalene Acetic Acid) is commonly used to prevent fruit drop in chili by improving fruit retention and reducing premature shedding.
(a) GA3: Promotes growth but does not prevent fruit drop effectively.
(c) Ethrel: Used for fruit ripening, not for preventing drop.
(d) Auxin: A general term, NAA is a specific type of auxin.
Important Point: NAA is typically applied as a foliar spray at a concentration of 20-40 ppm.