The company's new policy was clear and concise it offered employees greater flexibility.
Correct: A
The original sentence is a comma splice, incorrectly joining two independent clauses with only a comma. A dash can be used to set off an explanation or elaboration, especially when it provides a dramatic or emphatic break. Here, the explanation 'it offered employees greater flexibility' is a direct consequence or elaboration of the policy being 'clear and concise', making a dash a suitable choice for emphasis. While a semicolon (C) or colon (D) could also work grammatically, the dash (A) emphasizes the direct result in a slightly more informal yet effective way often seen in ACT contexts.