The following line uses iambic pentameter:
B. I think that John is looking glum to me.
Iambic pentameter is whenever there are five feet in which there is an unstressed syllable followed by a stressed syllable.
Feet- are small groups of syllables.
(I think) (that John) (is look) (ing glum) (to me).
- bold= stressed
- italics= unstressed
- ( ) = feet