Why is weeding important?

The correct options are
A Weeds are not useful.
B Weeds compete with crops for nutrition.
C Weeds compete with crops for space.
D Weeds interfere in crop harvesting.
Weeds compete with crops for space and nutrition, sunlight and water. They can be removed by;
-Mechanical and physical methods of weed control which include hand pulling, mulching etc.
-Biological control methods which include using insects or pathogens for killing the weeds.
-Chemical control methods which include using chemicals such as weedicides.