由¹⁴CO和¹²CO组成的混合气体与同温、同压下空气（平均相对分子质量为29）的密度相同，则下列说法正确的是

A．混合气体中¹⁴CO和¹²CO的分子数之比为14∶15

B．混合气体中¹⁴CO和¹²CO的物质的量之比为1∶1

C．混合气体中¹⁴CO和¹²CO的质量之比为14∶15

D．混合气体中¹⁴CO和¹²CO的密度之比为1∶1

An analyst does research about capital structure and gathered the following information about a company:
·Return on assets is 5.0%
·Financial leverage (Total assets/equity) is 2.5
·Beta for the company's stock is 1.5
If the company wants to achieve a growth rate of 10% without changing its capital structure or issuing new equity, the maximum dividend payout ratio for the company would be closest to:

A. 10.0%
B. 12.5%
C. 20.0%