C is incorrect. If you strip away the non essentials, it reads "the reason is because", but grammatically correct is "the reason is that.." as in B, or "because" as a substitute for "the reason is"
its b ;
The statement that contains an error in logic is option C, which incorrectly combines 'the reason is' with 'because'. This redundancy makes it less clear than options B and D. Therefore, option C is the one with a logical error.
;