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c, 

there are 3 static objects in all of the above pictures and only option c has all of them.

It's d.

When two objects overlap, they disappear in the next image and are replaced by two other objects, one where the overlapping objects were and the other on the next object, clockwise. Everything else stay the same, hence d.

haha, i also see it as "d" :D my choice was between a and d, but because the overlapping objects take on a total different form in the next sequence, it make sense that d would be correct:)

my answer is D....

the rhombus becomes star

the moon becomes arrow

the letter N should be become letter L 

d

Well, do you know the reason ? 

D.

In every figure there are two objects that overlap. They are being replaced by two new objects.
In the fourth figure, the N and the rectangle need be replaced. The only one of the five given possibilities that provides replacement for the rectangle and the N and leave the others intact is d.

D!!!!!!!!!!!!!!!!!!!!!

looks like b to me...

oh yeah, it is D because the N is also a shape.

c

I'm leaning towards a simply because every time shapes were mixed they yielded a straight-lined object. 

The other figures that mixed contained both curved and straight lines yielding a completely straight-line object.  So for fig.2, curves + straight = straight (the star); for fig.3, (curves + straight) + curves = straight (the arrow); ergo fig.4 should be straight + straight = straight (the box). 

I can see how it might be d, however, since if any combination of curves and straight still yields a straight-lined object, then straight + straight might operate like -1 x -1 = 1.  But, it seems to me the simplest, most logical rule is "two objects combined yield a new object with only straight lines."