In "the red-headed league," why does sherlock holmes beat upon the pavement outside of jabez wilson's office?

a.
he wants to find out if the ground under the pavement has been dug out.

b.
he wants to find out where john clay is hiding in saxe-coburg square.

c.
he wants to find out whether wilson can hear him inside the office.

d.
he wants to find out how strong his walking stick is in case he needs to protect himself.

i am thinking its a, but i really dont know, a or b.

The correct answer is:  A.  He wants to find out if the ground under the pavement has been out.   Sherlock Holmes hitting the pavement with his vault was looking for a hollow place, according to the sound emitted by the blow, maybe he is looking for a basement.

i have to go with a for this one

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.