how to parse

<p>And it is even more difficult to understand just why they think that this maneuver was calculated to save Russia and destroy the French; for this flank march, had it been preceded, accompanied, or followed by other circumstances, might have proved ruinous to the Russians and ________ for the French.
1 lax
2 jagged
3 intermittent
4 salutary</p>

<p>I couldnt parse and understand nothing of this .</p>

<p>any answer ? </p>

<p>Salutary. Ruinous is bad, salutary is good.</p>

<p>Is there any answer ? </p>