Final answer:
To change the statement into an interrogative sentence, rephrase it to 'Does Sindhu do everything spontaneously?' by moving the auxiliary verb 'does' to the front.
Step-by-step explanation:
The statement 'Sindhu does everything spontaneously' can be changed into an interrogative sentence by modifying the sentence structure to ask a question instead of making a declaration. The correct interrogative form of the statement would be: 'Does Sindhu do everything spontaneously?' This is achieved by placing the auxiliary verb 'does' at the beginning of the sentence, followed by the subject 'Sindhu', and then the base form of the verb 'do', with the adverb 'spontaneously' closing the sentence.