<p>The correct answer is <strong>(A) by</strong>.</p>
<p>In this sentence, the word "by" is used to indicate the method or means by which the company wants to increase production. The company wants to increase production by introducing bonuses for employees who meet the output quota. This means that the bonuses will be the means or method used to achieve the goal of increasing production.</p>
<p>The other options, (B) over, (C) from, and (D) regarding, do not convey the same meaning as "by" in this context. "Over" typically indicates a higher quantity or value, "from" indicates a source or origin, and "regarding" indicates a topic or subject. None of these options accurately convey the intended meaning of increasing production through the method of introducing bonuses.</p>