Move A Day - #3 B
Forgive the delay, I've been swamped.
1. e4 c5 2. Nf3 d6 3. d4 cxd4
Correct Response(s) - Nxd4 is objectively best. c3 is not particularly unusual.
Pawns are traded, the position is opened a little, and the tension grows.
Diagram: