Which meaning of marked most closely matches its meaning in the following excerpt?

I need such words from you far more than you can need them from me, especially where your superior labors and devotion to the cause of the lately enslaved of our land are known as I know them. The difference between us is very marked. Most that I have done and suffered in the service of our cause has been in public . . .

A. | adjective | having a visible mark

B. | adjective | clearly noticeable and evident

C. | verb | make a visible stain

D. | verb | show the position of