Crestfallen he returned as he had never faced such humiliation in the whole of his life.

The correct answer is A. disturbed.

Crestfallen means feeling very disappointed or discouraged. The other options are incorrect because:

• B. vainglorious means excessively proud of oneself.
• C. triumphant means feeling or showing great joy or satisfaction because of a victory or
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  success.
• D. indignant means feeling or showing anger or annoyance at something considered unjust or unworthy.

In the given sentence, the man is described as being crestfallen because he has never faced such humiliation in his whole life. This suggests that he is feeling very disappointed and discouraged.