What kind of transformation converts the graph of $f(x)=-7 x$ into the graph of $g(x)=-7 x-7$?
Atranslation 1 unit down
Btranslation 1 unit right
Ctranslation 1 unit up
Dtranslation 1 unit left
Atranslation 1 unit down
Btranslation 1 unit right
Ctranslation 1 unit up
Dtranslation 1 unit left