challenge: According to Collins & Śniady (2006), what is a characteristic of the Weingarten functions for orthogonal and symplectic groups?
  
  A. They are parameterized by partitions such that all parts have even size
  B. They are only applicable to the unitary group
  C. They are parameterized by partitions with only odd parts
  D. They are similar to the case of the special linear group
  Answer: 