The user bobby is trying to grant ownership of a file to rosie, as shown below. Why is this not working?

bobby@ubuntu: $ echo this is some content $>$ myfile.txt

bobby@ubuntu: $ ls $-$l myfile.txt

$-rw-r-r-11$ bobby friend $21$ Feb $308$:$38$ myfile.txt

bobby@ubuntu: $ grep rosie $/$etc$/$passwd

rosie$1003$:$1003$:$,,$ :$/$home$/$rosie:$/$bin$/$bash

bobby@ubuntu: $ chown rosie myfile.txt

chown: changing ownership of 'myfile.txt$\text{'}$: operation not permitted

a$.$ Because bobby is not the owner

b$.$ Because only root can change ownership

c$.$ Because the file belongs to the group friend

d$.$ Because rosie is has no writing permission on the file