You know that the second blank has to do with something
restricting the blood flow because of the second half of the sentence (it
tells us that we are dealing with “reduced blood flow”). The first
blank, then, has to be filled in with a word synonymous to dangerous or
unhealthy because the second half of the sentence contrasts that idea.
Advantageous and healthful you can throw out because you know those are
positive words. Innocuous means harmless, so throw that out as well.
Injurious you can tell is negative (root: injure), and deleterious means
harmful. Out of those answer choices, you are left with stoppage
and progression. Since you know the second word has to deal with
a restriction of blood flow, the correct answer has to be deleterious and
stoppage (B).