The answer to this would be option B. This is the only sentence that uses an introductory word to the noun clause that is used as an adverb. If you will notice, the noun clause here is "when the flagpole was painted". And this noun clause modifies the verb "know". Hope this helps.
Answer:
D) One must look for leverage points to change a system,
Explanation:
Systems thinking is a way of reasoning where businesses as seen as whole entities instead of fragments. Thus, when problems arise, a holistic approach is adopted in solving the matter instead of analyzing them in parts. For the company above, the best leverage point should have been sought to handle the arising problem so that a problem does not arise because of a change. Low leverage points occur when a small force causes a large negative change while high leverage points occur when a small force causes a big positive change.
Frankenstein
http://schools-wikipedia.org/wp/f/Frankenstein.htm
I cant see this it is too small can you do a bigger picture