Ecologist: Without the intervention of conservationists, squirrel monkeys will become extinct. But they will survive if large tracts of second-growth forest habitat are preserved for them. Squirrel monkeys flourish in second-growth forest because of the plentiful supply of their favorite insects and fruit. Which one of the following can be properly inferred from the ecologist's statements? ['If conservationists intervene to help squirrel monkeys survive, then the squirrel monkeys will not become extinct.', 'At least some of the conservationists who intervene to help the squirrel monkeys survive will do so by preserving second-growth forest habitat for the monkeys.', 'Without the intervention of conservationists, large tracts of second-growth forest habitat will not be preserved for squirrel monkeys.', "No habitat other than second-growth forest contains plentiful supplies of squirrel monkeys' favorite insects and fruit."]