What is the difference between vine yard and vine area?

[Marcus]

Test No. incompl/inter-6 "The Farmer and his Sons", question 5

He told them that they would find it in one of his 3 vine ......... but he didn't tell them which one it was.

(a) yards
(b) feet
(c) spaces
(d) areas

Test No. incompl/inter-6 "The Farmer and his Sons", answer 5

He told them that they would find it in one of his 3 vine yards but he didn't tell them which one it was.

Correct answer: (a) yards

Your answer was: incorrect
He told them that they would find it in one of his 3 vine areas but he didn't tell them which one it was.
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Hello,
What does "yards" in this sentence mean?

[Alan]

This word is used to describe, as it were, the farm where the vines are grown
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English as a Second Language
You can read my ESL story Everything in the Garden is lovely