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Please help me fill in the blank:
The ..........produced at our factory in Scotland.
A.good are.
B.good is.
C.goods are.
D.goods is.
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I have to slightly disagree with MM in this instance. A singular form, "good", is used in certain technical contexts. However, it's rather unusual, and you can safely ignore it for the purposes of your question.
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Mister Micawber I really should use a dictionary more often.
I'd have given the same response as you.

GPY was right to point out that it's not 100% correct, but most native speakers do not know of the existence of the singular form, let alone use it. It's not in the Oxford ALD, and Michael Swan includes goods in his list of 'common words which are normally plural and uncountable' in Practical English Usage.
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In my experience, the word product/products is much more common than the word goods.

Comments  
Anonymousgoods or good? countable or uncountable noun?
'Goods' is a plural-only countable noun; it has no singular form.
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GPY A singular form, "good", is used in certain technical contexts
Yes. I really should use a dictionary more often.

[IN SINGULAR]: the market price of an agricultural good
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 Clive's reply was promoted to an answer.
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Goods are