Concept:This is a question tag completion, but the main statement is missing.
A tag's form depends entirely on the main sentence that comes before the blank.
Explanation:Without the actual sentence, no single option can be chosen with certainty.
Each option follows a specific pattern if the main sentence were given.
A positive statement using "could" takes the tag "couldn't she".
A negative statement using "could" takes the tag "could she".
A positive statement using "would" takes the tag "wouldn't she".
A negative statement using "would" takes the tag "would she".
Since none of these conditions can be verified, the missing sentence is essential.
Therefore, the correct completion cannot be identified from the options alone.
Answer:Cannot be determined from the information given.