The correct option is A Tens
Say:
We know that the place on the right side is ones.
Then come tens and hundreds, respectively.
For example, in 345, there are 5 ones, 4 tens, and 3 hundreds.
5 is the 1st digit from the right, and its place value is ones.
4 is the 2nd digit from the right, and its place value is tens.
Hence, the place value of the 2nd digit from the right of a number is tens, and option C is the correct answer.