Identify the phrase in parenthesis in each sentence.
The five senses enable us (in interact) with our world.
prepositional
participial
gerund
infinitive
If you meant to write "to interact", then the answer would be the last option, "infinitive". There is no preposition, so it cannot be "prepositional", a participle has to end with -ing, as well as gerund. So this has to be an infinitive.
