IMO A

Vk_Vinayak

When you provide answers, try to provide your explanation, so that it will be helpful for readers to get benefit from your posts....and even for you in future for reference

vk_vinayak wrote:IMO A

Taking note of the success of local farmers' markets, the university's food service providers have transitioned into a locally-grown, sustainable operation

have transitioned into a locally-grown, sustainable operation
(singular "operation" disagrees with plural "providers" unless the providers have merged into one operation)

have transitioned into sustainable, locally-grown operation
(same agreement problem as A, also missing the indefinite article "a")

have transitioned into locally-grown, sustainable operations
(works well; agreement problem fixed)

are transitioned into sustainable, locally-grown operations
("are transitioned" is awkward and incorrect)

are transitioning into locally-grown, sustainable operation
("are transitioning" could be okay if it is an ongoing process, but we still have the same problems here that we have in B)