Martin Richards (born 21 July 1940) is a British computer scientist known for his development of the BCPL programming language which is both part of early research into portable software, and the ancestor of the B programming language invented by Ken Thompson in early versions of Unix and which Dennis Ritchie in turn used as the basis of his widely used C programming language.
B programming language was written after BCPL programming language
BCPL is the ancestor of B programming language this implies B programming language was written after BCPL was written. This is a correct statement and the system couldn't perform a negation.