Fill in the blanks with the most appropriate option:-

One of the 7 wonders of the world ………… situated in India.

is

The correct option to fill in the blanks is is.

The sentence is about the Taj Mahal, which is one of the 7 wonders of the world and is situated in India. The present tense singular form of the verb "to be" is "is". It is the most appropriate verb tense to use in this context, as the Taj Mahal is still situated in India.

The other options are not as appropriate:

• Are is the present tense plural form of the verb "to be". It is not accurate to use "are", as the Taj Mahal is not plural.
• Was is the past tense singular form of the verb "to be". It is not accurate to use "was", as the Taj Mahal is still situated in India.
• Were is the past tense plural form of the verb "to be". It is not as appropriate as "is", as it does not convey the same sense of presentness or immediacy.