Chess Opening Theory/1. e4/1...c5/2. Nf3/2...d6/3. d4/3...Nf6/4. dxc5
dxc5 seems like an enticing move for white for a queen exchange and displacing black's king but is easily diffused in this line with Nxe4.
Nc3 is currently the preferred white move in the main line, however Bb5 or Bg5 are widely accepted but less played through openings.