To form the comparative degree of adverbs, you should add which of the following words? ?

a. great or little

b. most or least

c. all or none

d. more or less

and if you answered ! : 3

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.