Correct option is A
Correct answer – (a)
A population of 4000 plants is required to detect 0.10% off-types reliably.
Information Booster / Facts
Lower tolerance requires larger population size.
Why other options are incorrect
(b) 400 plants are statistically insufficient.
(c) 2000 plants do not meet required accuracy.
(d) 800 plants are inadequate for 0.10% tolerance.