The correct option is C tens, 9 x 10
The place values in a decimal numbers are:
hundreds ← tens ← ones ← ˙ → tenths → hundredths → thousandths.
In the given decimal number 92.1, 9 is present at the tens place, 2 is present at ones place and 1 is present at tenths place. So, the required values are tens, 9 × 10.