The sentence says that if we force children who use their left hand to use right hand may lead to speech difficulties and may create behavioral problems.

Option A - incorrect
It is idiomatically wrong as there's the use of the wrong verb tense 'creating.' It doesn't show a link between 'forcing children to use their left hand...' and 'the difficulties...'

Option B - incorrect
This answer choice has the same issue as option A, using 'ing' form of verb is idiomatically wrong.

Option C - correct
It fixes the parallelism error in the sentence by linking the first and second sentence together using the verb 'create.' It also corrects the idiomatic error in the sentence by using 'but may also' instead of 'may not only.'

Option D - incorrect
The semicolon used here breaks the sentence into two parts. Therefore, this answer claim is wrong because both sentences are meant to be linked so as to create a logical meaning for the first sentence.

Option E - incorrect
It has the same issues as option D but the inappropriate part of the sentence is the second statement.