Lower-level management function

lheiannie07 wrote:Lower-level management function most effectively when they have thorough training and unimpeded communication with workers, supervisors, and one another.

(A) management function most effectively when they have
(B) managers function most effectively when they have
(C) management functions most effectively when they have
(D) managers function most effectively when they have received
(E) management functions most effectively when it has

What is wrong with Option E?

OA B

The problem with E is the usage of "one another." Though there's a bit of debate about this among usage guides, "one another" typically refers to interaction involving more than two people. In other words, if there were three managers, those managers could conceivably communicate with one another. (And two managers could communicate with each other.) But if there is a single "management," as there is in answer choice E, there is only one entity, and therefore that entity cannot logically communicate with "one another."