Final answer:
The underlined words should be written as 'D. Farmers and chefs around the world' to maintain the right tone in sentence 2.
Step-by-step explanation:
To maintain the right tone in sentence 2, the underlined words should be written as D. Farmers and chefs around the world. This option maintains a professional tone and accurately represents the diverse group of people who support the Slow Food movement. Using options A, B, or C would either be too informal or not capture the inclusivity of the movement.