Which sentence from the article contains information that should be left out of an abstract?

Question

A. “ Mechanical engineer Oliver O’Reilly began looking into this telltale problem three years ago, after trying to teach his young daughter to tie her shoes.”
B. “This result suggest lace made from heavier materials may be more prone to screwing up, because unless you’re phenomenally gifted at tying even knots, one free end will likely be longer than the other.”
C. Right off the bat, they found shoelaces didn’t untie when a person just swung their foot nor when they only stamped the ground.”
D. “The team acquired a high-speed camera and pointed it at Gregg’s shoes as she ran on a treadmill.”

Answer 1

D. “The team acquired a high-speed camera and pointed it at Gregg’s shoes as she ran on a treadmill.”