A crescendo of metallic thuds arose from the market, where the iron-smiths were ...... the pieces of metals.

Solution (By Examveda Team)

Let's break down the clues in the sentence:

1. "A crescendo of metallic thuds": This tells us about the sound. It's the sound of metal hitting metal, getting louder and louder.
2. "iron-smiths": These are people whose job is to work with iron or other metals, usually by heating them and shaping them.
3. "pieces of metals": This is the material the iron-smiths are working on.

So, we need a word that describes the action an iron-smith performs on metal that creates "metallic thuds."

Let's look at the options:

Option A: flattening
"Flattening" means making something flat. While an iron-smith might make metal flat, "flattening" describes the result of the action, not the action itself that creates the "thuds." The sound comes from the *hitting*, not from the state of being flat. So, this isn't the best fit for the verb that causes the sound.

Option B: striking
"Striking" means to hit something forcefully. Iron-smiths do hit metal forcefully to shape it, and this action definitely causes "metallic thuds." This is a good general word for hitting.

Option C: hammering
"Hammering" means to hit something repeatedly with a hammer. Iron-smiths are known for using hammers to shape metal. This word perfectly describes the action of repeatedly hitting metal, which produces exactly the kind of "crescendo of metallic thuds" mentioned in the sentence. It fits the profession (iron-smiths) and the sound described perfectly. This is a very strong and specific option.

Option D: thrashing
"Thrashing" means to hit someone or something repeatedly and violently, often in a wild or uncontrolled way. While it involves hitting, "thrashing" doesn't usually describe the skilled and deliberate work of an iron-smith shaping metal. It sounds too violent or random for the context of craftsmanship.

Why Option C is the best answer:
While "striking" (Option B) is generally correct, "hammering" (Option C) is more precise and accurate for what an iron-smith does. They use a hammer to work on metal, and the sound of "metallic thuds" is exactly what you would hear from the action of hammering. It's the most natural and professional term for this situation.

Therefore, the iron-smiths were hammering the pieces of metals.