The correct answer is: B. Boor : Offensive
A diplomat is someone who is skilled in handling delicate situations and dealing with people from different cultures. A tactless person is someone who is not sensitive to the feelings of others and may say or do things that offend them. A boor is a rude or inconsiderate person. An offensive person is someone who is likely to cause anger or upset in others.
The other options do not have the same relationship as the original pair of words. A coward is someone who is afraid to face danger or risk. An intrepid person is someone who is brave and fearless. A charlatan is a person who pretends to be something they are not, usually in order to deceive others. A guileful person is someone who is cunning and deceitful. A starving person is someone who is very hungry. A weak person is someone who is not strong or healthy.