Which are the places in one’s period (when numbers are represented in the international system)?
A) ones and tens
B) ones, tens and hundreds
C) ones
D) ones, tens, hundreds and thousands

Hint: The numerals in each period is read as a three-digit number. There are periods like ones, thousands, millions etc.

Complete step-by-step answer:
In the International system of numeration, all the periods have three place values each. Since each period has three place values, so to write a number with the help of comma(s), we have to put a comma after every three digits from the right.
We are asked about the places in one’s period. Since it is the first period, starting from the right we have ones, tens and hundreds

So, the correct answer is “Option B”.

Additional Information: In the Indian system of Numeration, starting from the right, the first period is ones, consisting of the place values ( ones, tens and hundreds). The next period is thousands consisting of two place values (thousands and ten thousand). The third period is lakhs consisting of two places (lakhs and ten lakhs) and then crores and so on. This system is also known as Hind-Arabic System.

Note: Since Indian system and International system have differences in periods and place values, we must check carefully what is asked. International system has every period identically three digits as the same time Indian system has first three and two for all others.