Final answer:
Block selection is the least desirable statistical sampling method for auditors because it does not ensure each population element has an equal chance of being selected, potentially introducing bias.
Step-by-step explanation:
Among the options provided, the least desirable statistical sampling technique for auditors is B. Block selection. This method involves selecting contiguous sequences or 'blocks' of items from the population, which may introduce bias as it does not ensure that every element has an equal chance of being selected. This contrasts with random number table selection, systematic selection, and random number generator selection, all of which are designed to give each population element a random and equal chance of being included in the sample. Block selection is therefore less desirable for auditors who require a representative sample to draw valid conclusions about the entire population.
Random number table selection (A) and random number generator selection (D) use randomness to ensure each element has an equal chance of being selected. Systematic selection (C) also provides each element with a chance for selection, but it uses a fixed interval, which can still be representative if the population does not have a systematic pattern that coincides with the chosen interval.