Final answer:
The least positive rational number is the smallest number that is both positive and a rational number. In the given options, only 1/3 could be the least positive rational number.
Step-by-step explanation:
The least positive rational number is the smallest number that is both positive and a rational number. A rational number is any number that can be expressed as a fraction, where the numerator and denominator are both integers. In the given options, only option D) 1/3 is a positive rational number. Therefore, option D) 1/3 could be the least positive rational number.