He impresses his boss with his performance.

His boss is impressed by his performance.
His performance impresses his boss.
His boss is impressed at his performance.
His boss is impressed in his performance.

The correct answer is: A. His boss is impressed by his performance.

The other options are incorrect because they do not make sense in the context of the sentence.

  • Option B: His performance impresses his boss. This is incorrect because the subject of the sentence is “he,” not “his performance.”
  • Option C: His boss is impressed at his performance. This is incorrect because the preposition “at” is used to indicate a location or position. In this sentence, the boss is not impressed at a specific location or position, but rather by the employee’s performance.
  • Option D: His boss is impressed in his performance. This is incorrect because the preposition “in” is used to indicate a location or position. In this sentence, the boss is not impressed in a specific location or position, but rather by the employee’s performance.

In conclusion, the correct answer is: A. His boss is impressed by his performance.