Final answer:
The negation of the statement "those baskets are completely full" is "those baskets are not completely full," which simply adds "not" to the original statement to achieve negation.
Step-by-step explanation:
The negation of a statement is the denial of that statement. In the case of the provided statement "those baskets are completely full," the correct negation would be "those baskets are not completely full." This is because the simplest form of negation is achieved by adding the word "not" to the original statement. Therefore, among the provided options, "those baskets are not completely full" is the accurate negation of the given statement.