Which sentence does not contain any punctuation errors?




A.

It would be fun, I think, to go up in a hot-air balloon.



B.

It would be fun, I think to go up in a hot-air balloon.



C.

It would be fun I think, to go up in a hot-air balloon.



D.

It would be fun I think to go up in a hot-air balloon.

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A or C, i think. plz help