Correct option is D. The old maxim "Let the buyer beware" suggests that as buyers are responsible.
Here, the singular 'a buyer' does not correspond to the plural pronoun 'we' and thus the underlined portion is ungrammatical. Only D rectifies this without any other error.
Caveat emptor is a Latin phrase that can be roughly translated in English to "let the buyer beware." While the phrase is sometimes used as a proverb in English, it is also sometimes used in legal contracts as a type of disclaimer. In many jurisdictions, it is the contract law principle that places the onus on the buyer to perform due diligence before making a purchase.
The term is commonly used in real property transactions–as it relates to the sale of real estate property after the date of closing–but it also applies to the transactions of other types of goods, such as cars.
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