Select the number from among the given options that can replace the question mark (?) in the following series.
$$25,40,70,115,175,?$$

Let's look closely at the differences between successive numbers:
* $40-25=15$
* $70-40=30$
* $115-70=45$
* $175-115=60$

The differences form a continuous arithmetic sequence of consecutive multiples of $15$ ($15,30,45,60$). The next multiple value should be $15\times 5=75$.

Adding this to the last term:

$$175+75=250$$