The correct option is B 0.5
Aligning the decimal point,
0.23
0.5
we start comparing the digits from left side.
0.23
0.5
The unit place digit is same for both the numbers. Hence, we move to one place right.
0.23
0.5
Comparing tenths place, we find that 5>2.
As a result, 0.5 is larger than 0.23.