Answer:
Step-by-step explanation:
The one that requires no explanation is sample. You are just taking a small amount to see what it is like.
The other two have problems.
Flavor is possible. It means you are checking out the texture and spice content. You are being a bit more careful in what you are doing. It is a more thorough examination (scientific) of what the food is like. You caould pick it.
Nibble is also OK. It refers to how much you will take.
The problem is that the last two are not as good as the first one.