The author should avoid using information that is biased or "unreliable".
They should use reliable and credible sources.
While Manoj is intelligent, I am less intelligent.
D) OMIT the underlined portion.
Archaeologists often begin their analysis when they return with the artifacts to a safe place, such as a laboratory. It sounds way better like this and it wouldnt sound right with any of the other options.
^_^
