Which is the angle of the depression from a to b?

The angle of depression at A is ∠1

Option 3 is correct

Step-by-step explanation:

Angle of depression: It makes angle at top point with horizontal.

We need to find angle of depression from A to B. We will find the angle at point A with horizontal.

At vertex A make only one angle with horizontal.

∠1

For depression: We see from top to bottom and angle of depression makes at top.

Angle of depression at A = ∠1

Hence, The angle of depression at A is ∠1

i believe the answer is c.