Where should I place “what clause”?

[October wind]

(A) We should take what they say seriously.
(B) We should take seriously what they say.

Are they both equally natural? Is one better than the other?

 

[tedmc]

I think both are natural but A is better, i.e. "take something seriously", in general.

 

[5jj]

Only the first works for me.

 

[Tarheel]

I think the first one is more likely.

 

[SoothingDave]

Yes, the first is natural, but there's nothing wrong with the second.