The correct answer is iambic.
An iamb is a metrical foot which consists of two syllables, the first one of which is unstressed, followed by a stressed one. On the other hand, a trochee is also made up of two syllables, however, the first one is stressed, and the one following it is unstressed.
In the word advise, the first syllable ad- is unstressed, and the one after is, -vise, is stressed, thus making this word an iambic one.