Answer:
line ED
Step-by-step explanation:
Let analyse all possible answer:
a. line CD
From the photo, you can see it lies on the plane A and only point D is either on plane A or B.
b. line ED
From the photo, you can see the point E and D are lying on plane A and B.
c. point C
Only in plane A
d. point D
point D is on plane A or B.
However, to describes the intersection of 2 planes, we usually use the a line or a segment to have a better explanation because it goes through all the common points of the two planes
