The correct option is A foreign
Indigenous means originating or occurring naturally in a particular place; native. The opposite of indigenous is foreign, or of, from, in, or characteristic of a country or language other than one's own. Hence, Option D is correct. Among the rest of the options, cheap means low in price, especially in relation to similar items or services, native means low in price, especially in relation to similar items or services, silly means having or showing a lack of common sense or judgement. These options do not express this antonym, hence incorrect.