Introduction:
The death of roots can be caused by various factors, including pulling out, scorching, and choking. All of these factors can negatively impact the root system and ultimately lead to the death of roots.

Pulling out:
Pulling out or uprooting a plant can directly result in the death of its roots. When a plant is forcefully uprooted, the delicate root structures can be damaged or broken, making it difficult for the plant to absorb water and nutrients. This can eventually lead to the death of the plant.

Scorching:
Scorching or excessive heat can also cause the death of roots. High temperatures can lead to the drying out of the soil, making it difficult for the roots to access water. Additionally, heat stress can damage the root cells, impairing their ability to function properly. Without adequate water and nutrients, the roots may die, leading to the death of the plant.

Choking:
Choking refers to a situation where the roots are deprived of oxygen due to excessive water or compacted soil. When the soil becomes waterlogged, it displaces the air present in the soil pores, preventing the roots from obtaining oxygen. Without oxygen, the root cells cannot undergo respiration, which is essential for their survival. Similarly, compacted soil restricts the movement of air and water, leading to oxygen deprivation and root death.

Conclusion:
In conclusion, all of the options (a) pulling out, (b) scorching, and (c) choking can lead to the death of roots. Pulling out the plant can physically damage the roots, scorching can cause dehydration and cell damage, and choking can deprive the roots of oxygen. It is important to provide optimal growing conditions and avoid these factors to ensure the health and survival of plant roots.