The correct choice is:
\[ \text{A. } 80x + 120y \leq 4800, \quad x \geq 0, \quad y \geq 0 \]
{"axisType": 3, "coordSystem": {"xmin": 0, "xmax": 60, "ymin": 0, "ymax": 40}, "commands": ["y = (4800 - 80x) / 120"], "latex_expressions": ["$80x + 120y \\leq 4800$"]}