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Sentence Correction: Subject Verb Agreement - X of Y Subject

Analysts in the real-estate market are claiming that much of the recently available properties in which foreign investors are expressing interest promises to generate considerable earnings for those who buy on time.

Incorrect.

While this answer choice corrects the original Parts of Speech mistake, it is stylistically flawed. The addition of the phrase that are (recently available) is redundant; changing in which foreign investors are expressing interest to that foreign investors are expressing an interest in is also wordy and awkward

Incorrect.

This answer choice repeats the original Parts of Speech mistake. The article much can describe only non-count nouns whereas properties is a count noun.

[[snippet]]

Incorrect.

While this answer choice corrects the original Parts of Speech mistake, it is grammatically incorrect. The singular verb promises does not agree with the plural article many (of the recently available properties). 

What helps identify this question as a Subject Verb Agreement question as well as identify the mistake is the following Stop Sign:

an x of y subject

Well done!

This answer choice corrects the original Parts of Speech mistake by changing much to many. The article much can describe only non-count nouns whereas many is used to describe a count noun (properties).

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect. The article much can describe only non-count nouns whereas properties is a count noun.

[[snippet]]
much of the recently available properties in which foreign investors are expressing interest promises
much of the recently available properties in which foreign investors are expressing interest promise
many of the recently available properties in which foreign investors are expressing interest promise
many of the properties that are recently available and that foreign investors are expressing an interest in promise
many of the recently available properties in which foreign investors are expressing interest promises