What is an example of a choice which is not necessitated by scarcity? I am first year economics student and for the past month we have had it constantly drilled into us that all choices have an opportunity cost and thus they are all necessitated by scarcity. Thus when I saw this quesiton in my homework I was baffled. 

I don't need an exact answer to this, but a hint would be great. My current line of thinking is leaning towards infinite resources like the sun, but I simply can't work it out. Thanks.
The basic idea behind scarcity and opportunity cost is fundamental to economics. Basically, if resources are infinite, you have everything.

In my opinion, there are no infinite resources because a lifetime is finite. In one way or another, it can be argued all choices are necessitated by scarcity.

Eating chips means at that time, you cant be eating a burger. That is your opportunity cost.

This may be the point of your homework question, to make you realise that scarcity is a key driving force behind decision making.