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

The correct answer is 250.

To find the number that replaces the question mark (?) in the series, let's analyze the difference between each pair of consecutive terms:

$40-25=15$

$70-40=30$

$115-70=45$

$175-115=60$

Notice that the differences themselves form an arithmetic sequence where each step increases by 15 (15, 30, 45, 60, ...).

To find the next difference in the sequence, add 15 to the previous difference:

$60+15=75$

Finally, add this difference (75) to the last term of the given series (175) to get the missing number:

$175+75=250$

Therefore, the number that replaces the question mark is 250.