<p>The correct answer is (B) incidental.</p>
<p>The word "incidental" is an adjective that means happening as a minor accompaniment to something else. In the context of the sentence, it means expenses that are not directly related to the main purpose of the business travel.</p>
<p>The sentence states that the company will pay for your main expenses when you travel for business, but will not reimburse you for the incidental ones. This means that the company will cover the essential costs of your travel, such as airfare, accommodation, and meals directly related to your business activities. However, they will not reimburse you for additional expenses that are not directly related to the purpose of the trip, such as personal entertainment or leisure activities.</p>
<p>Therefore, option (B) incidental is the correct answer as it best fits the meaning of the sentence.</p>