Nico invested an amount a year ago and calculated his retum on investment. He found that his purchasing power had increased by $15$ percent as a result of his investment. If inflation during the year was $4$ percent, then Nico's

A$.$ nominal return on investment is more than $15$ percent

B$.$ nominal return on investment is less than $11$ percent

C$.$ real retum on investment is equal to $4$ percent

D$.$ real return on investment is more than $15$ percent