Accepted Answer
After items, D. A colon (:) start an enumeration, which in your case has the items a microscope,a test tube,and a thermometer.you place the : before the first of the items, so after "items".
After items, D. A colon (:) start an enumeration, which in your case has the items a microscope,a test tube,and a thermometer.you place the : before the first of the items, so after "items".