Answer:
b) Decrease
Explanation:
When a company use borrowed money to repurchase shares, the borrowed money is at a cost, therefore the earnings per share will only increase if the company's earning yield(earnings per share/price per share) is greater than the after-tax cost borrowing rate.
However in the case that the after-tax cost borrowing rate is equal to the company's earning yield, the earnings per share will remain the same, and if the after-tax cost borrowing rate exceeds the company's earning yield, the earnings per share would decrease.