To answer this question, you need to understand idiomatic expressions. Let's go through each option to understand why it is correct or incorrect:
Option A) A cash cow - This option is correct because it means a good source of money or profit. It is often used to describe an investment or business that consistently generates a significant amount of money.
Option B) As strong as an ox - This option is incorrect because it means very physically strong. It does not convey the idea of a good source of money.
Option C) A horse of a different color - This option is incorrect because it means something completely different or unrelated. It does not convey the idea of a good source of money.
Option D) A dark horse - This option is incorrect because it means a little-known or unexpected candidate or competitor who unexpectedly wins. It does not convey the idea of a good source of money.
The correct answer is A) a cash cow. This option is correct because it conveys the idea of a good source of money or profit, which aligns with the given expression "a good source of money" for our company.