The correct option is B 0.34 < 0.43 < 0.56 < 0.65
To arrange the decimal numbers in increasing order, we have to compare the tenths digits.
The greater the tenths digit, greater is the value.
Among all the given options, 3 is the smallest digit in the tenths place, and 6 is the largest digit in the tenths place.
Hence, arranging the numbers from the smallest to the largest, we get:
0.34 < 0.43 < 0.56 < 0.65