This is a question referred to grammar topics.
When you adding the prefix called inter to the word it change the meaning.
It has his origin in Latin and means inside of, between of. Some authors explain that it has a relation so close with words intra and intro.
However, the use of a word depend of the context that you are studying.
In conclusion, according the question is " Between states"
air, heir aisle, isle
some sum son, sun
stair, stare stationary, stationery
steal, steel suite, sweet
tail, tale
D. All of the above.
Each of those items are equally important when presenting/preparing.