The geologist examined the rock samples under a microscope ______ and recorded the mineral composition in her field notebook.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
;
- Bcheck_circle
(empty)
- C
,
- D
—
Explanation
"Examined...and recorded" forms a compound predicate (one subject, two verbs). No comma is used before "and" in this construction.