Correct Answer: Alien

Solution : The first option is the correct answer.

Indigenous refers to something that is native to a particular place or region, having originated or been produced there. On the other hand, alien denotes something foreign, not originating in or belonging to the place in question.

The meanings of other options are as follows:

• Innate means inherent, existing from birth, natural.
• Natural means by nature, not made or caused by humans.
• Primitive refers to an early stage of development, simple or basic.

Therefore, the correct answer is alien.