The following sentence may have an error in effective writing. The sentence or part of the sentence is underlined. Choose the best revision for the underlined part. If no revision is necessary, choose the first answer.
When the museum authorities investigated they found several mysterious
crates in the basement.
Question 3 options:
When the museum authorities investigated they found several
When the museum authorities investigated; they found several
When the museum authorities investigated, they found several
When, the museum authorities investigated they found several