The correct answer is A. sequentially cohesive.
A sequentially cohesive function is a function that has a single, well-defined sequence of steps. In this case, the function takes in a quantity, validates that it is greater than 1, subtracts 1 from it, and prints the result. This is a clear and unambiguous sequence of steps.
The other options are incorrect because they do not accurately describe the function. A logically cohesive function is a function that is logically consistent. In this case, the function is logically consistent because it does not contain any errors or contradictions. However, this does not mean that it is sequentially cohesive. A communicatively cohesive function is a function that is easy to communicate to others. In this case, the function is easy to communicate to others because it is well-defined and easy to understand. However, this does not mean that it is sequentially cohesive. A functionally cohesive function is a function that performs a single, well-defined task. In this case, the function performs a single, well-defined task: it takes in a quantity, validates that it is greater than 1, subtracts 1 from it, and prints the result. However, this does not mean that it is sequentially cohesive.
In conclusion, the correct answer is A. sequentially cohesive.