The best replacement for c3 is c4 plants.

The best alternatives to c3 are rated as following:
★★★★★  c4 plants
★★★  c4
★★  c4 photosynthesis
★★  c4 corvette
★  samsung corby
★  official
★  e63
★  c4 pathway
★  e5
★  x4
★  c300
★  nokia e63
★  c3 pro
★  mumble
  e71
  cam plants
  samsung corby wifi
  nex 5
  teamspeak
  x3
  c5
  5233
  corby
  5n
  c2
  star smilez
  e72
  pantech c300
  501 c4
  x2
  ruckus
  501 c6
  samsung chat 335
  c1
  nokia 5233
  renault clio
  x3 02
  x2 01

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Google Trends

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c3
c4 plants
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