The correct options are
A The seedlings grow beneath or near the parent plant so they will not get sufficient nutrients.
B The competition for light, space, water and nutrients exists between every one of the seedlings as well as with the parent plant.
This is important because if the seeds are not dispersed, many germinating seedlings will grow very close to the parent plant. This results in competition between every one of the seedlings as well as with the parent plant. The competition is for light, space, water and nutrients.