Review the item:
Because her hands were still slippery with soap, Marilyn dropped the watermelon, which __________ on the floor in an explosion of pulp and seeds.

The blank requires the past tense of burst, an irregular verb. Burst is one of two correct forms.

Verb Simple
Present
Simple
Past
Past
Participle
burst burst(s) burst or bursted burst or bursted

Busted, the choice you made, is slang. Although people do use busted, you should avoid it, especially in formal situations. Before you continue, review the rules for irregular verbs.

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