Correct option is D
The correct answer is over crowding.
(a) Avoid competition for sunlight, water and minerals: Seed dispersal helps distribute seeds away from the parent plant, reducing competition for resources like sunlight, water, and minerals with the parent and its siblings.
(b) Invade new habitats: By dispersing seeds to new locations, plants can establish themselves in new habitats and expand their range.
(c) Produce new varieties: Seed dispersal can lead to genetic variation in offspring as the seeds may land in different environments and interbreed with other plants of the same species. This variation is crucial for adaptation and evolution.
(d) Overcrowding: This is the most likely exception. Seed dispersal actually helps to prevent overcrowding by spreading seeds out. If all the seeds landed right next to the parent plant, they would be competing fiercely for resources and many wouldn't survive.
Therefore, the answer is: (d) Overcrowding