Two circular football grounds of radius 42 m and 35 m are to be replaced with a bigger circular ground. What would be the radius of this newground if the newground has the samearea as the sum ofthe two small grounds?

A

$$\sqrt{2979}$$ m

B

$$\sqrt{2981}$$ m

C

$$\sqrt{2999}$$ m

D

$$\sqrt{2989}$$ m