Answer
There is no common difference so the given terms cannot be terms of an arithmetic sequence.
Work Step by Step
The given terms can be terms of an arithmetic sequence if there is a common difference among consecutive terms.
Determine the difference between each pair of consecutive terms to obtain:
$4-2=2;
\\8-4=4;
\\16-8=8$
There is no common difference so the given terms cannot be terms of an arithmetic sequence.