Answer:
The correct option is 3.
Step-by-step explanation:
The sequence is called an arithmetic sequence if the difference between every two consecutive terms are same.
In sequence 1, 5, 8, 13, ...


Since
, therefore the sequence 1, 5, 8, 13, ... is not an arithmetic sequence.
In sequence 2, 4, 8, 32,...


Since
, therefore the sequence 2, 4, 8, 32,... is not an arithmetic sequence.
In sequence 25, 21, 17, 13, ...



Since this sequence has common difference of -4 therefore the sequence 25, 21, 17, 13, ... is an arithmetic sequence.
In sequence 81, 27, 9, 3, ...


Since
, therefore the sequence 81, 27, 9, 3, ... is not an arithmetic sequence.
Hence the correct option is 3.