Answer :
it's a because the form for being proportional is
ab=k
or
a/b=k
4/6=k
4 times 6=k
then 5 times 7=k
false so
so there is no ratio so the answer is A
ab=k
or
a/b=k
4/6=k
4 times 6=k
then 5 times 7=k
false so
so there is no ratio so the answer is A