Hello, Adroit33, and welcome to the Grammar Exchange!

I'd like to know where you have you taken this exercise from. The first sentence contains at least two mistakes. "having arrived" is better than "arriving," and "at" should follow the verb "arrive" when referring to specific places like a theater or a restaurant ("in" is only mostly used with cities and countries).

It'd also be useful if next time you could tell us which you think is the right answer. In this case, the answer is (3): when he arrived at the theater, the movie had already started.

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