The Greek base which means to burn is

Cla-
Path-
Sat-
Cau(s)-

http://dictionary.reference.com/browse/cauterize

caustic

Γαμο

The Greek base that means "to burn" is "Cau(s)-".

To determine this, we can break down the options provided and look for their Greek origins:

1. "Cla-" does not have a direct connection to the meaning of burning in Greek.
2. "Path-" comes from the Greek word "pathos," which means suffering or feeling, but does not relate to burning.
3. "Sat-" doesn't have a direct connection to burning in Greek.

Therefore, the correct option is "Cau(s)-", which comes from the Greek word "kaio" or "kaiein" (καίω), meaning "to burn."