begin mathsize 12px style From space figure comma
angle ACB space equals space 180 degree space minus space angle ACD equals space 180 degree space minus space 125 degree equals space 55 degree
OR space angle BCA space equals 55 degree
In space Right space triangle space ABC
angle ABC space plus space angle BCA space plus space angle CAB space equals space 180 degree
rightwards double arrow 90 degree space plus space 55 degree space plus space straight x space equals space 180 degree
rightwards double arrow straight x space equals space 35 degree
Hence comma space correct space option space is space left parenthesis straight a right parenthesis. end style