Answer:
Option (A)
Explanation:
From the triangle ABC given in the picture,
Since, ∠BAC and ∠BCA are equal in measure, opposite sides of these angles will be equal.
AB = BC
Therefore, ΔABC is an isosceles triangle.
By applying Pythagoras theorem in ΔABC,
AB² + BC² = AC²
AB² + AB² = AC² [Since, AB = BC]
2(AB)² = AC²
2(AB)² = (26)²
AB² =

AB =

AB =

=
units
Therefore, Option (A) will be the answer.