Final answer:
Coarse soil texture and high soil permeability are the soil factors that increase the vulnerability of groundwater.
Step-by-step explanation:
The soil factors that tend to increase the vulnerability of groundwater are both A and B, which are coarse soil texture and high soil permeability. Coarse soil texture refers to larger particles, such as sand, which allows water to flow more easily through the soil. High soil permeability means that the soil has a high rate of water flow.