Not only are the cost of organic produce and the

The correct answer is B.

Really, the only answer choices here are B and E. Whenever you have Not only, you need to have but also as well. B just sounds better.

Isn't in the idiom not only....but (also), also optional.

Going with B

using the idiom: not only..but also...

I thind As well in B is redundant.... but no other choice is right.

so I will go with B.

C

(A) the variety of such organically grown products is increasing as well
-the idiom is not only X but (also) Y
(B) also the variety of such organically grown products is increasing as well
-out, to have also and as well is redundant. it's sufficient to have also
(C) the variety of such organically grown products is also increasing
-this looks fine


I guess D and E are wrong because it's the word variety that should be
emphasised. not only the cost and the availability are increasing but also the variety is increasing.

Both A and C looks ok but I'll go for C.

OA is C.

OE:

Spot the Error:
Notice idiomatic triggers. Not only is part of a common idiom.
Rule and Fix:
Memorize the common idioms. Not only should be followed by "but also" (though the two words do not have to be together)

POE:
A should be eliminated all other choices contain an also somewhere.

Chunk and Compare:
Compare B to C.
B uses also and as well which is redundant.

Compare C to D and E.

The difference is the comparison. C says not only are the cost increasing .... but the variety is increasing while both D and E have a different comparision not only are the costs increasing ...but also the increase

C is the only logical comparison. Reread your choice:
Choose C