Which number will best complete the relationship given below?
25:9::16:?

Select the option that is related to Figure C in the same way as Figure B is related to Figure A.

Among the four answer figures, which can be formed from the cut pieces given below?

Figure A is related to B in a certain pattern. Following the same pattern, figure C is related to D. Study the pattern and select the figure which should be placed in place of D.