Which of these rules is applicable to subtracting two values that have different numbers of decimal places (for example, subtracting 2.1 from 2.15)? the answer is less accurate than either value. the answer is more precise than either value. the answer has the same number of decimal places as the least precise value. the answer has the same number of significant figures as the most precise value.

The answer has the same number of decimal places as the least precise value.  

Step-by-step explanation:

We know that in subtraction, the important thing is the decimal place occupied by the last significant figure.

When we subtract two values having different number of decimal values, the resulting answer can have number of decimal places less than or equal to the number of decimal places in every term.

For e.g. 2.15 - 2.1 = 0.05 and 7.96-7.2 = 0.76

Hence, option C i.e.'the answer has the same number of decimal places as the least precise value' is correct.