Mayor: Migrating shorebirds stop at our beach just to feed on horseshoe-crab eggs, a phenomenon that attracts tourists. To bring more tourists, the town council plans to undertake a beach reclamation project to double the area available to crabs for nesting. Birdwatcher: Without a high density of crabs on a beach, migrating shorebirds will go hungry because shorebirds only eat eggs that a crab happens to uncover when it is digging its own nest. Which of the following, if true, would provide the mayor with the strongest counter to the birdwatcher's objection? ['The additional land made available by the reclamation project will give migrating shorebirds more space.', 'On average, tourists who come to the town in order to watch birds spend more money there than tourists who come for other purposes.', 'Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly.', 'Some of the migrating shorebirds make only one stop during their migration form South America to Canada.']