Find the next picture in this inductive test !

**Solution of this inductive test :**

In this question, there are two rules to follow :

The first rule is that the curved and straight-edged shapes interchange. Following this rule, the curved shape should be at the top and the straight-edged shape should be at the bottom in the next diagram of the sequence. Therefore, the correct answer could be B or D.

The other rule is that the black spot moves from the centre, to the top, to the bottom, back to the centre, etc. Following this rule, the black spot should be at the bottom in the next diagram in the sequence. Therefore, the correct answer is B.

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