Explanation:

- Umling La: Located in the Ladakh region of India, Umling La is recognized as the world's highest motorable pass. It has an elevation of over 19,300 feet, surpassing all other motorable passes.

- Chang-La: This pass also lies in the Ladakh region and stands at an elevation of around 17,590 feet. It's known for its scenic beauty and challenging driving conditions.

- Lanak La: Not as widely known or recognized as a high-altitude pass in competitive terms with others on this list.

- Khardung La: Previously known as one of the highest motorable passes, standing at an elevation of approximately 17,582 feet. It was once considered the highest before Umling La took that title.

The correct answer is Umling La.

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