Q1Single correct3 Marks10 May 2026

Consider the following Python functions: ``` def a(n): if n < 10: return n return a(n // 10) def c(n): if n <= 1: return 1 return n * c(n - 1) def mystery(x): # one line is missing here: pass ``` Given that mystery(8) == 4, what should replace the missing line?

A

return x

B

return a(c(x))

C

return c(a(x))

D

return x // 10