English Grammar: Choosing the Correct Modal Verb - 'Can' for Ability

A. must: 'Must' expresses obligation or necessity.
B. should: 'Should' expresses a recommendation or advice.
C. could: 'Could' expresses possibility or past ability.

D. can

The correct answer is D. can. The sentence describes the robot's ability to do housework. 'Can' is used to express present ability.

Here's why the other options are incorrect:

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