Answer :

According to the question,

AB = AC


ACB = ABC (i)


Now, ACD >ACB =ABC (Side BC is produced to D)


And, In ∆ADC, side DC is produced to B


ACB>ADC (ii)


ABC>ADC


Now, using (i) and (ii),


AD >AB


Hence, the reason is wrong but the assertion is true.


Option C is correct

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