'An' is used before words starting with vowel sound. 'Indefinite' starts with vowel sound.

In first blank, article "" will be used because "Browns" belong to a particular family.
In second blank, "no article" will be used because 'dinner' is a meal and we do not use articles before names of meals.

No article is required.

Here, 'moment' is unspecific. The sentence also indicates 'one' moment. Hence, we need to use an indefinite article. Since moment starts with a consonant sound, correct article is 'a'.

For indefinite, uncountable nouns, eir no article is used, or we use a word that describes quantity such as some, considerable, little.
'Light' is uncountable noun.

'The' is used as a definite article for specific objects or objects that both speaker and listener know. Specific car that speaker bought day before is mentioned. Hence, '' article will be used.

The word "very" is irrelevant. "Popular dancing" takes a determiner, in this case "a".

Here, a specific newspaper 'Times of India' is being talked about. 'The' article will be used.

In first blank, 'Nature' is a proper noun and should not be preceded by any article.
In second blank, 'spring' is a specific season and time of year. Hence, definite article '' will be used.

Option C is correct as 'The' is used with words with superlatives. 'Noblest' is superlative.