Correct choice is C:
If and whether are used to show conditions. If is usually used for multiple conditions or "If .. not" IDIOM.
As usually is used to compare clauses but I believe in this case C is the right choice since the sentence denotes the action of eating again and again... you will know. Also note "as .. often" IDIOM
Also, the Idiom is " If <present> (then) <future>"
If you eat <present>..., you often find <present> - which is incorrect. The correct usage would be "If you eat...., you will ..."
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AS vs IF
Source: Beat The GMAT — Sentence Correction |
D is wrong because If....then construct is not followed.
If + present sentence+ then+ will + base verb (ofcourse then is optional in the sentence)
If + present sentence+ then+ will + base verb (ofcourse then is optional in the sentence)












