Explanation:

In the sentence Once again, higher food inflation, in combination with fuel and power, provided ______ to the wholesale inflation. It is clear that the main topic is inflation and how it has spread in the wholesale market.Now if we look at the sentence it is mentioning about the fastening of inflation. So to fill the blank correctly we will have to see which word is most suitable for explaining the fastening force or energy. So if we look at the options and their meanings:

1 Impression - an idea, feeling, or opinion about something or someone

2 Inspiration-the process of being mentally stimulated to do or feel something, especially to do something creative.

3 Insight - the capacity to gain an accurate and deep understanding of someone or something.

4 Impetus - the force or energy with which a body moves.

Hence it is clear that option 4 is the most suitable to fill in the blank.

Once again, higher food inflation, in combination with fuel and power, provided impetus to the wholesale inflation.