In 2010, archaeologist Norel Hidalgo Tan was visiting the twelfth-century temple of Angkor Wat in Cambodia when he noticed markings of red paint on the walls of the temple ________ the help of digital imaging techniques, he discovered the markings to be part of an elaborate mural containing over 200 paintings.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
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