Modern producers, when they need reliable sources

[BTGmoderatorDC]

Modern producers, when they need reliable sources of original equipments and technologically advanced components to operate profitably, face increasingly difficult choices of owning the producers of these items, a practice known as backward integration and buying from independent manufacturers

A. Modern producers, when they need reliable sources of original equipments and technologically advanced components to operate profitably, face increasingly difficult choices of owning the producers of these items, a practice known as backward integration and buying from independent manufacturers

B. Modern producers, who need reliable sources of original equipments and technologically advanced components to operate profitably, face an increasingly difficult choice between owning the producers of these items, a practice known as backward integration, and buying from independent manufacturers

C. Modern producers, who need reliable sources of original equipments and technologically advanced components to operate profitably, face an increasingly difficult choice to either own the producers of these items, and to buy from independent manufacturers, a practice known as backward integration

D. Needing reliable sources of original equipment supplies, and technologically advanced components to operate profitably, modern producers facing an increasingly difficult choice of owning the producers of these items, and buying from independent manufacturers, a practice known as backward integration

E. Modern producers practice what is known as backward integration, when they need reliable sources of original equipment supplies and technologically advanced components to operate profitably, and to face an increasing and difficult choice of owning between the producers of these items and buying from independent manufacturers

What is wrong with other Options?

OA B

[GMATGuruNY]

OA: sources of equipments
equipment cannot be pluralized.
Thus, the OA is not viable.
I would ignore this SC.
What is the source?

[BTGmoderatorDC]

OA: sources of equipments
equipment cannot be pluralized.
Thus, the OA is not viable.
I would ignore this SC.
What is the source?

Thanks a lot!