The decimal expansion of 31/2.5 will terminate after:

Correct option is B

Solution:

Rewrite the denominator in fractional form:
​$$\frac{31}{2.5} = \frac{31}{\frac{5}{2}}$$​​

Simplify by multiplying the numerator and the denominator by 2 to eliminate the decimal:
​$$\frac{31 \times 2}{\frac{5}{2} \times 2} = \frac{62}{5}$$​​

Now, divide to find the decimal expansion:
​$$\frac{62}{5} = 12.4$$​​

Since the decimal expansion 12.4 terminates after one decimal place, the correct answer is:
The decimal expansion of  $$\frac{31}{2.5}$$​ will terminate after one decimal place. Thus, the correct option is B.