CHAT: C in Greek Alphabet

I was in a bookstore last Saturday just looking
through their languages section. I picked the
book "Teach Yourself Ancient Greek" off the
shelf and looked through it. I noticed that the
book used the Latin capital C and lowercase
c in the Greek texts in place of the usual sigma
(with no distinction between initial and final
sigma). A note in the front of the book said
they were doing this because the use of C
rather than the traditional form "was becoming
the norm in works of Ancient Greek."

Why is that?

--Ph. D.

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