Total Cost Curve Properties Steps:

• Examine the diagram's axes: output (Q) on x-axis, total cost (TC) on y-axis.
• Observe TC at Q=0 equals fixed costs (intercept >0).
• Note TC rises with Q, reflecting variable costs.
• Confirm upward slope and convexity, indicating increasing marginal costs.

Why A is correct:

• A matches the standard TC curve: starts above origin (fixed costs) and slopes upward, per TC = FC + VC formula.

Why the others are wrong:

• B shows TC starting at origin, ignoring fixed costs.
• C depicts downward slope, violating cost increase with output law.
• D illustrates a linear curve, neglecting accelerating marginal costs.

Final answer: A