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A)

Explanation:

All the angles of a triangle add up to 180°.

∠A is a right angle so it is 90°

∠ACB plus ∠DCB add up to a straight angle, 180°. Since ∠DCB is 140° ∠ACB must be 40° in order for it to equal 180°.

if you add ∠A (90°) and ∠ACB (40°) you get 130°. Because the angles in a triangle always add up to 180° ∠B must be 50°.

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explanation: