Boundaries: Punctuation and Sentence Structure

SAT Reading and Writing· difficulty 2/5

The prototype passed every safety inspection ______ but the manufacturer delayed production while sourcing more reliable components.

Which choice completes the text so that it conforms to the conventions of Standard English?

  • A

    ;

  • B

    ,

    check_circle
  • C

    (empty)

  • D

    :

Explanation

Two independent clauses joined by the coordinating conjunction "but" take a comma before "but."

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