12.The logic behind the catch-up effect is that
(A)workers in counti ies with low income will work harder than workers in countries with high incomes.
(B)the capital stock in rich countries deteriorates more rapidly tlian the capital stock in poor countries.
(C)new capital adds more to production in a country that doesn’t have much capital than in a country that already has much capital.
(D)None of the above are correct.