It's C but you don't really need to write a Venn diagram. That just takes longer. it's just 2 cause and effect statements.
if NO keyboard skills then NO computer use. if No computer use then NO word processing.
inferred: if NO keyboard skills then No word processing.
A) A is wrong because it assumes that keyboarding skills mean some use of the word processor but the statements don't necessitate that. there could be other reasons that you can't use the word processor
B) B is wrong because it assumes the effects are the cause. there may be other reasons you can't use word processing besides no computer use & no keyboarding skills. it's somewhat the same as A but worded differently
C) is right because it MUST be true given the statements above. no one with out some keyboarding skills will be ever able to use the word processor. it doesn't mean they will automatically be able to but it's an initial requirement
D) uses "probably" and the question askes what must be true. u don't even have to look at it
E) E does the same as A and B and assumes the effect can be the cause... but not so much.
I wouldn't use a Venn diagram. if I had to write itout I'd use letters and arrows to show cause & effect like:
-Kb => -Comp
-Comp => -W Procs
He that is in me > he that is in the world. - source 1 John 4:4