It is difficult to grow cacti in a humid climate. It is difficult to raise orange trees in a cold climate. In most parts of a certain country, it is either easy to grow cacti or easy to raise orange trees. If the statements above are true, which one of the following must be false? ['Most of the country is hot.', 'It is not possible to raise cacti in the country.', 'Half of the country is both humid and cold.', 'Most parts of the country are humid.']