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Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

In the sum $KAN + GA = ROO$ each letter stands for a different digit. What is the answer to the subtraction $RN - KG$ ?

(A) $10$ (B) $11$ (C) $12$ (D) $21$ (E) $22$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.