Final answer:
Well graded soil is good for construction because it has a balanced mix of different particle sizes and allows for good compaction and drainage. The correct option is B.
Step-by-step explanation:
The soil that is good for construction is well graded. Well graded soil contains a balanced mix of different particle sizes, including sand, silt, and clay. This type of soil allows for good compaction and drainage, which are important factors in construction.
On the other hand, gap graded soil has a poor balance of particle sizes, with some sizes missing. This can lead to uneven settling and instability in construction projects.
Poorly graded soil is characterized by having a narrow range of particle sizes, which can limit its strength and stability.
Uniformly graded soil consists of particles that are all of similar size. While it can have good stability, it may lack good permeability, which is important for drainage in construction. The correct option is B.