The following CFG is not LL$(1)$ because it has common prefixes. The grammar after simple factoring becomes:

A$-->$ abcD

A$-->$ abb

D$-->$d

a$.$

A$-->$abX

X$-->$cD $|$ b$|\backslash$lambda

D$-->$d

b$.$

A$-->$abX

D$-->$cD $|$ b

X$-->$d

c$.$

None of them is correct.

d$.$

A$-->$abX

X$-->$cD $|$ b

D$-->$d