The  Rebuttal: Debunking the Conspiracy Theorists
 1.4 How could a Moon rock near the Apollo 17 landing site be etched with the letter “C”.
 
ü The letter “C” on the rock is an artifact of the copy of this photograph.  It does not appear in the original.
Clearly, the “C” appeared when the copy was made, adding fodder for the conspiracy theorists.
original
copy