The correct answer is A. vainglorious.
A vainglorious person is someone who is excessively proud of themselves and their achievements. They often boast about their accomplishments and put others down in order to make themselves look better. This is not the case with the person in the question, who is described as being “crestfallen”. Crestfallen means feeling very disappointed or discouraged, especially after a failure or setback. This suggests that the person in the question is not vainglorious, but rather someone who is humble and down-to-earth.
B. indignant means feeling or showing anger or displeasure at something considered unjust or unworthy. This is not the case with the person in the question, who is described as being “crestfallen”. Crestfallen means feeling very disappointed or discouraged, especially after a failure or setback. This suggests that the person in the question is not indignant, but rather someone who is feeling down and out.
C. triumphant means feeling or showing great joy and satisfaction because of a victory or success. This is not the case with the person in the question, who is described as being “crestfallen”. Crestfallen means feeling very disappointed or discouraged, especially after a failure or setback. This suggests that the person in the question is not triumphant, but rather someone who is feeling defeated and downtrodden.
D. disturbed means feeling or showing anxiety or worry. This could be the case with the person in the question, but it is not the most likely explanation. The person is described as being “crestfallen”, which suggests that they are feeling very disappointed or discouraged. This is more likely to be caused by a failure or setback than by anxiety or worry.