The correct answer is: A. Has, beaten.
The verb “to beat” can be used in a number of ways, but in this case it is being used in the sense of “to defeat.” The past tense of “to beat” is “beat,” so the correct answer is “has beaten.”
The other options are incorrect because they do not make sense in the context of the question. “Do” is the present tense of “to do,” so it would not be used to talk about something that happened in the past. “Is” is the present tense of “to be,” and “beaten” is the past participle of “to beat,” so “is beaten” would not make sense in the context of the question. “When” is a question word, so it would not be used to make a statement.
In conclusion, the correct answer is: A. Has, beaten.