Correct Answer - Option 4 : Glorious
Let’s see the meanings of all the words so that we can find the synonym of resplendent.
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Resplendent means beautiful and seeming to shine: eg: The fields were resplendent with flowers.
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Dull means lacking brightness, vividness, or sheen.
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Lusterless means not bright or shiny; dull.
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Gloomy means dark or poorly lit,
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Glorious means very beautiful. eg: He had a long and glorious military career.
So it is obvious that the synonym of resplendent is glorious in Option 4 as all the other options 1,2 and 3 are antonyms.
Option 4 is the right answer.