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 find the difference between consecutive terms in the series:
* $40-25=15$
* $70-40=30$
* $115-70=45$
* $175-115=60$

The differences form a sequence of successive multiples of $15$:

$$15,30,45,60,\dots$$

The next difference must be:

$$60+15=75$$

Therefore, the missing number is:

$$175+75=250$$