Answer:
B. Fantastic ways to make a fortune now
Step-by-step explanation:
In poetry, an iamb is a metrical foot (a group of syllables) that has one UNSTRESSED syllable followed by a STRESSED syllable. There are six types of iamb and its classification is based on the number of iambs there is per lines: dimeter (two iambs per line), trimester (three iambs), tetrameter (four iambs), pentameter (five iambs) or hexameter (six iambs).
From all the choices, option B is the only line that is made of iambs because it has the syllable pattern of iambs: unstressed, stressed, unstressed, stressed... Check it in the following sentence where all stressed syllables are underlined, and all unstressed syllables are not underlined:
B. Fantastic ways to make a fortune now
Furthermore, this line is a pentameter because it consists of five iambs.