Which shape comes next in the series?

See here what other people have answered:

  • D
  • C
  • B
  • A
57%
19%
14%
10%
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Interesting fact:

Did you know that you really can think with your guts? Our intestines contain 30 types of neurotransmitters and 100,000 neurons. It is our gut bacteria that makes serotonin – the happy hormone.

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