Choose the option which best corrects the underlined word-
Villas, bungalows, skyscrapers, apartments buildings- all houses were subject to the same rules.
a) No change
b) Buildings;
c) Buildings,
d) Building_

Hint:The error in the given statement is of a punctuation mark. A punctuation mark is a mark such as a full stop, a comma, or a question mark, used in writing to separate sentences and their elements and to clarify meaning.

Complete answer:
Punctuation is the use of spacing, conventional signs, and certain typographical devices as aids to the understanding and correct reading of the written text, whether read silently or aloud.
Now, let us examine all the given options to find out the correct answer -
Option ‘a’ is No change. We will use this option when the other three options are not correct and the given sentence is already correct.
Option ‘b’ is Buildings; It is a semicolon (;) symbol. It is commonly used as orthographic punctuation. In the English language, a semicolon can be used between two closely related independent clauses.
Option ‘c’ is Buildings, A comma is used here. It appears in several variants in different languages. It has the same shape as an apostrophe or single closing quotation mark. We use commas to separate independent clauses.
Option ‘d’ is Building_ An underscore (_) is used here. It is used to create a visual spacing in a sequence of words where whitespace is not permitted.
As we have analyzed all the given options we can easily figure out the correct answer. Here, the correct form is – Buildings,. Hence, option ‘c’ is the correct option.

Note:
All the other options are plausible distractions. Don’t confuse between ‘buildings;’ and ‘buildings,’. A semicolon cannot be used here, as two independent clauses are separated.