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'the real McCoy' originally referred to machinery that contained the drip cup invented by Elijah McCoy.

The phrase 'the real McCoy' was coined to describe machinery that included McCoy's reliable lubricating devices, specifically the drip cup he invented. This indicates that the expression was directly tied to the functionality and trustworthiness of his inventions in the machinery.

A) machinery that contained the drip cup invented by Elijah McCoy

This option is correct as the extract explicitly states that 'the real McCoy' referred to machinery that had McCoy's lubricating device, the drip cup. The phrase emerged from the confidence in the reliability of his inventions, making this the most accurate interpretation.

B) any device actually invented by Elijah McCoy

This option is incorrect because the phrase specifically pertains to machinery containing the drip cup, not to all devices invented by McCoy. While he held multiple patents, 'the real McCoy' does not encompass all of his inventions.

C) Elijah McCoy himself

This choice is incorrect as the phrase does not refer to McCoy as an individual, but rather to the quality and reliability of the machinery associated with his inventions. The phrase highlights the trust in his work rather than his personal identity.

D) the Elijah McCoy Manufacturing Company

This option is incorrect because 'the real McCoy' does not reference the company itself but focuses on the machines that utilized his innovative lubricating devices. The company is a separate entity from the phrase's specific context.

E) later versions of the drip cup invented by Elijah McCoy

This choice is incorrect as the phrase was coined in relation to the original drip cup and its reliability, not later versions. The phrase signifies the authenticity of the initial invention, rather than subsequent iterations.

Conclusion

The correct answer, A, is supported by the passage, which clearly indicates that 'the real McCoy' pertains to machinery utilizing McCoy's drip cup. Other options fail to align with this definition, as they either broaden the meaning beyond the specific context or misinterpret the phrase's origin. Thus, A encapsulates the essence of the phrase accurately, reinforcing the significance of McCoy's invention.