Explanation:
The correct answer is option A: in.
Here's why:
Prepositions are words that show the relationship between a noun or pronoun and another word in the sentence. In this case, the preposition is used to show the location of the marriage.
The preposition in is used to indicate a location within a larger area or space. It is commonly used to indicate being inside or within a particular place.
In the given sentence, we are talking about the location where the brother got married. Since London is a city, we use the preposition in to indicate that the marriage took place within the city of London.
Here are the explanations for the other options:
- On: This preposition is used to indicate a specific day or date. However, in this context, we are referring to a location, not a specific day or date, so it is not the correct preposition to use.
- During: This preposition is used to indicate a period of time. While it is possible to say "during the wedding ceremony," it is not the most appropriate preposition to use when talking about the location of the wedding.
- Into: This preposition is used to indicate movement or direction towards the inside of something. It is not the correct preposition to use when talking about the location of an event like a wedding.
To summarize, the correct preposition to use in the given sentence is in, as it correctly indicates that the brother got married within the city of London.

Explanation:

Prepositions:
- Prepositions are words that show the relationship between a noun or pronoun and other words in a sentence. They are essential for understanding the context of a sentence.
- In this case, the correct preposition to use with the verb "married" is "in" when referring to the location where the marriage took place.

Correct Answer:
- The correct answer to the question "My brother got married ______ London" is option 'a) in'.
- This implies that the wedding ceremony took place in London.

Other Prepositions:
- While prepositions like "on" and "during" are commonly used with other events or activities, they are not appropriate in this context.
- The preposition "into" implies movement or direction towards the inside of something, which does not fit the context of a marriage location.

Conclusion:
- Understanding the correct use of prepositions is crucial for conveying the intended meaning in a sentence.
- In this case, using the preposition "in" with the verb "married" accurately describes the location of the marriage ceremony in London.