Transform "I prefer tea to coffee." using "rather".

The correct transformation of "I prefer tea to coffee" using "rather" is captured well with the option stating that "I would rather have tea than coffee." This structure accurately conveys a preference between two choices while incorporating "rather."

The phrase "I would rather" indicates a personal preference and is commonly used in English to express this sentiment. It effectively shifts the original sentence into a more fluid conversational form. The word "than" is essential here, as it serves to compare both options in the context of preference, aligning with the comparative nature of the original statement.

This option embodies the meaning of the original sentence while also utilizing the requested transformation effectively. The choice emphasizes the desire for tea over coffee, which maintains the integrity of the initial statement while adhering to the grammatical and syntactical norms associated with using "rather."