Which word could replace the underlined word as it is used in the paragraph?

aunt izzy is my father’s sister, and her laugh is distinctive. it’s hard to describe, but you can’t miss it. her laugh is loud, but deep and hearty, and sometimes it sounds like she’s on the verge of hiccupping. whenever we are meeting her in a crowded place, we just follow her laugh. she’s usually entertaining people with one of her stories.

a.
common

b.
unusual

c.
appealing

d.
annoying