M Kuralı ile Açı Hesaplama

Verilen şekilde $[BA || [DE, m(\widehat{ABC}) = 30^{\circ}$ ve $m(\widehat{CDE}) = 40^{\circ}$'dir.

Buna göre $x$ kaç derecedir?

A) 60

B) 70

C) 80

D) 90

Soruda görsel içerik var: The image shows a geometry problem hand-drawn on grid paper. It features two vertical parallel lines labeled 'BA' and 'DE' (though the orientation is sideways in the photo). Between these parallel lines, a zigzag line connects points B, C, and D, forming an 'M' shape. The angle at point B is labeled as $30^{\circ}$ and the angle at point D is labeled as $40^{\circ}$. There is an unknown interior angle $x$ at the vertex C, which is shaded with a purple circle. Mathematical text indicates $BA \parallel DE$.