Congruence Of Triangles

Maths
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ABC is an isosceles triangle with AB AC and D is a point on BC such that  (Fig. 7.13). To prove that a student proceeded as follows:

and
AB AC (Given)
  (because AB AC)
and
Therefore,
So,
What is the defect in the above arguments?

A
It is defective to use for proving this result.
B
It is defective to use for proving this result.
C
It is defective to use for proving this result.
D
Cannot be determined
Easy
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If by SSS congruence rule then

A
B
C
D
Easy
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If by SSS congruence rule then :

A
B
C
D
Easy
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