Given below are some names of the compounds. (p) Acetals, (q) silicones, (r) ferrocene, (s) glyoxal, (t) ethyl acetate, (u) gammaxene. The set which is NOT having a double bond between an element and O, that is $$\text{E} = \text{O}$$ where E is any element in the periodic table, as a functional group is

A

p, s, u, t

B

p, q, r, s

C

q, r, s, t

D

p, q, r, u