Question

as the mighty battle came to its climax, gerald crawled up on a chair and stood on the kitchen table, waving his arms triumphantly. in this sentence, triumphantly means: in a manner that displays forceful exertion in a conscious manner in an annoyingly playful manner in an extremely joyous, victorious, or celebratory manner

Explanation:

The context is a battle reaching its climax and Gerald's action of waving arms suggests joy and victory. "Triumphantly" relates to a sense of joy, victory, or celebration.

Answer:

In an extremely joyous, victorious, or celebratory manner