Is it who or whose to this sentence : who’s/whose muddy foot prints are those

Well, "who's" is who is, it's just a contraction. So, it'd be whose.

"Who is muddy foot prints are those?" doesn't sound correct, but

"Whose muddy foot prints are those?" does.

Hope this helps!

Question: Who's/Whose muddy footprints are those?

I think the answer would be "Who's".

a line graph will be best to show the income.

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.