Choose the most appropriate meaning of the given idiom/phrase:
To be in seventh heaven
a- To fly in the air
b- To be extremely happy
c- To be completely alone
d- To visit a place that is in the list of the seven wonders of the world.

Hint: An idiom refers to a group of words or a phrase that has a figurative meaning in comparison to the literal meaning of its words. Idioms are used by writers and poets to create a rhetorical effect.

Complete answer:
The idiom, ‘to be in seventh heaven’ refers to feeling delighted and overjoyed by something or someone.
This idiom was derived from the Christian saying that there are seven levels of heaven. And the seventh level comprises God and his angels. Hence, the seventh level is considered to be a stage of happiness.
Example- She has been in seventh heaven since she got promoted. Here, we can understand that X has been happy and overjoyed since her promotion.
Now, let’s look at the given options-
Option a- ‘To fly in the air’ is an incorrect option because it is different in meaning from the given idiom.
Option b- ‘To be extremely happy’ is the correct option because it is similar in meaning to the given idiom.
Option c- ‘To be completely alone’ is an incorrect option because it is different in meaning to the given idiom.
Option d- ‘To visit a place that is in the list of the seven wonders of the world’ is an incorrect option because it is completely different in meaning from the given idiom.
The correct answer is Option ‘b’.

Note:
The literal meaning of the idiom suggests that the person has reached the seventh level of heaven or died, whereas the metaphorical meaning suggests that the person has attained the level of happiness that one can achieve only in heaven.