I'd go with C.
A and D are out because "their" does not properly refer to "storm"
proper idiom is "for X, not Y"
E wrongly introduces a conjunction "and" which does not show contrast in the 2 actions
B does not follow proper idiom with the introduction of "for"
Ex: I'm doing this for Isabella, not Martha --> ok and concise
Ex: I'm doing this for Isabella, not for Martha --> wrong
E is nonetheless staring at me pretty badly