A process diagram shows how cement is manufactured. Which tense is most appropriate when describing the steps?
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A
Simple present passive (e.g., 'The limestone is crushed')
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B
Simple past active (e.g., 'Workers crushed the limestone')
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C
Present perfect active (e.g., 'Workers have crushed the limestone')
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D
Future passive (e.g., 'The limestone will be crushed')