According to Malthus, population grows geometrically, while food production grows arithmetically. This means that population growth is exponential, while food production is linear. As a result, population will eventually outstrip food production, leading to famine and starvation.
Option A is incorrect because population growth is not arithmetical. Option B is correct because population growth is geometrical. Option C is incorrect because population growth is not at a constant rate. Option D is incorrect because Malthus did believe that population growth would eventually outstrip food production.