Greece handed the European Central Bank an excuse to maintain the life support for its financial system by persuading its skeptical German-led creditors it’s serious about delivering the policies needed to escape a default. Less than three weeks after a Greek aid meeting broke up in taunts and acrimony, Finance Minister Yanis Varoufakis assured euro-area governments that his country is aiming to strike a bargain to win the final installments of its 240 billion-euro ($268 billion) aid program.