Read the passage. Cooper's gift in the way of Invention was not a rich endowment; but such as it was he liked to work it, he was pleased with the effects, and Indeed he did some quite sweet things with it. In his little box of stage properties he kept six or eight cunning devices, tricks, artifices for his savages and woodsmen to decelve and circumvent each other with, and he was never so happy as when he was working these innocent things and seeing them go. A favorite one was to make a moccasined person tread in the tracks of the moccasined enemy, and thus hide his own trail. Cooper wore out barrels and barrels of moccasins In working that trick. Another stage property that he pulled out of his box pretty frequently was his broken twig. He prized his broken twig above all the rest of his effects, and worked it the hardest. It is a restful chapter in any book of his when somebody doesn't step on a dry twig and alarm all [...] for two hundred yards around. Every time a Cooper person is in peril, and absolute silence is worth four dollars a minute, he is sure to step on a dry twig. There may be a hundred handier things to step on, but that wouldn't satisfy Cooper. Cooper requires him to turn out and find a dry twig; and if he can't do it, go and borrow one. In fact, the Leatherstocking Series ought to have been called the Broken Twig Series (from "Fenimore Cooper's Literary Offenses" by Mark Twain) According to the author, which is Fenimore Cooper's greatest failing as a writer? 01. He repeatedly uses the same contrivances. 02. He lacks understanding of his subject. 03. His titles are misleading and ambiguous. 04. His heroes never prevail and are boring.