Read the poem below and complete the instruction that follows.
“porphyria’s lover” by robert browning
the rain set early in to-night,
the sullen wind was soon awake,
it tore the elm-tops down for spite,
and did its worst to vex the lake: i listened with heart fit to break.
when glided in porphyria; straight
she shut the cold out and the storm,
and kneeled and made the cheerless grate
blaze up, and all the cottage warm;
which done, she rose, and from her form.
identify the metrical pattern.
a.) iambic with eight feet
b.) trochaic with four feet
c.) dactylic with eight feet
d.) iambic with four feet