Answer:
c. Times interest earned ratio
Step-by-step explanation:

The earnings before interest and taxes is the amount hte company has to pay up their interest.
less than 1 meas the company is not earning enought to cover their interest expense and needs to renegociate his debt.
1 means is earning exactly their interest
more than one means it has enought to pay their interest and make a gain
The recommended value for the ratio depend on the business type and economics of the country.
But at least it must be greater than 1 to have an economic viable business.