In which sentence does the introductory word to the noun clause function as an adverb?
a) she could not decide which scandinavian flag was her favorite
b) i do not know when the flagpole was painted
c) the historian said the flag was 200 years old
d) whatever my supervisor advised, i did

in "letter from a birmingham jail," king argues that there are four basic steps in any nonviolent campaign: "[c]ollection of the facts to determine whether injustices exist; negotiation; self purification; and direct action." finally, direct action is taken and acts such as boycotts and sit-ins are staged.