Final answer:
The measurement with two significant figures is c) 2.3 cm, where both digits contribute to its precision.
Step-by-step explanation:
The measurement that has two significant figures from the options provided is c) 2.3 cm. Significant figures are the digits in a measurement that carry meaning contributing to its precision. In option a) 500 mL, unless otherwise noted, the zeros are not considered significant, leaving only one significant figure. Option b) 26.59 km has four significant figures. Option c) 2.3 cm has exactly two significant figures because both the 2 and the 3 are meaningful to the measurement's precision. Option d) 0.00355 g has three significant figures as the trailing zeros in a decimal number are significant after the first non-zero digit.