Which of these is a nickname for London?

Here is the question :

WHICH OF THESE IS A NICKNAME FOR LONDON?

Here is the option for the question :

• City of Light
• Eternal City
• Queen City
• The Big Smoke

The Answer:

And, the answer for the the question is :

Explanation:

[STC0016297]. It might not seem that smokey now, but in the 19th century, the British capital was home to ‘pea souper’ fogs that blanketed the city in grey and black. These fogs were a result of air pollution, which was mostly generated by burning coal as fuel. The term “Big Smoke” was first used in reference to the city in a slang dictionary published in 1874. Smoky conditions remained throughout the decade of the 1950s, and it wasn’t until the Clean Air Act was passed in 1956 that the city was fully cleaned up.