Choose the correct singular form of "mice".

Correct option is A

The correct option is (a).

Mice is an irregular plural form. Its singular form is mouse. Many English nouns have irregular plural forms that do not take -s/-es, and mouse → mice is a common example.

Step-by-step reasoning:

• Identify that mice is plural.
• Recall irregular singular-plural pair: mouse (singular) → mice (plural).
• Therefore, singular is mouse.

Example: A mouse was hiding behind the cupboard.

Why other options are incorrect:

• (b) mices is not a standard English word.
• (c) mouses is generally incorrect for the animal; it may be used informally for computer devices, but exams accept mouse as singular.
• (d) mousses is unrelated (mousse is a dessert/foam).

So the correct answer is (a)