Question based-

3.2 Form, Structure, and Sense - Modifier placement and clarity
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Based on genetic evidence, archaeologists have generally agreed that reindeer domestiion began in the eleventh century CE. However, since uncovering fragments of a 2,000-year-old reindeer training harness in northern Siberia, blank may have begun much earlier.

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

A.

researcher Robert Losey has argued that domestiion 

B.

researcher Robert Losey’s argument is that domestiion

C.

domestiion, researcher Robert Losey has argued,

D.

the argument researcher Robert Losey has made is that domestiion