The Hindu-Arabic numeral system is the most commonly used numeral system in the world today. It is a decimal system, meaning it uses a base of 10. In this system, the digits 0 to 9 are used to represent numbers.

On the other hand, the Roman numeral system is an ancient numeral system that was used in ancient Rome. It uses a combination of seven letters to represent numbers. The letters used in the Roman numeral system are I, V, X, L, C, D, and M, which represent the values 1, 5, 10, 50, 100, 500, and 1000 respectively.

To convert a Roman numeral to the Hindu-Arabic form, we need to understand the rules of the Roman numeral system:

1. The letters I, X, C, and M can be repeated up to three times in a row. Each repetition increases the value of the Roman numeral.
2. The letters V, L, and D cannot be repeated.
3. If a smaller letter appears before a larger letter, it is subtracted from the larger letter. For example, IV represents 4 (5 - 1) and IX represents 9 (10 - 1).
4. If a smaller letter appears after a larger letter, it is added to the larger letter. For example, VI represents 6 (5 + 1) and XI represents 11 (10 + 1).

Now let's convert the Roman numeral XXXIV to the Hindu-Arabic form using these rules:

- The letter X represents 10, and it appears three times in a row. So, the value of XXX is 10 + 10 + 10 = 30.
- The letter IV represents 4, and it appears after a larger letter. So, the value of IV is 4.
- Adding the values of XXX and IV, we get 30 + 4 = 34.

Therefore, the Hindu-Arabic form for the Roman numeral XXXIV is 34, which corresponds to option A.

Because X=10 so it is repeated 3 times & IV =4.
So XXXIV =34 in Roman numerals.