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B) 300 J Kg^-1C^-1

Explanation:

By the formula of specific heat,

                                 Q=mcT

where Q is heat energy

           m is mass

           c is heat capacity

           T is change in temperature

By the given data,

                             Q = 15 KJ = 15 x 1000 = 15000J

                             m = 5 kg

                             T = 30°C - 20°C = 10°C

Now,

                            c=

                            c =

                            c = 300 J Kg^-1C°^-1

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.