The answer of how it is convert is the sun generates energy
by slowly contracting in size; converting gravitational potential energy into
thermal energy and this is called gravitational contraction. Gravitational collapse is the narrowing of an
astronomical object due to the effect of its own gravity, which tends to draw
matter inward toward the center of gravity.
The correct answer is - D. increased crop diversification.
By increasing the crop diversification there will be no problems in causing widespread, or any type of famine whatsoever. In fact, this can be very beneficial, and can actually help with the expected problem in the near future. With bigger diversification of the crops, we will get new types of crops that will be more resilient to certain types of climates, or even pests, and they can be grown on places where they typically can not be grown with their original genetics.
The mass limit of a white dwarf is 1.44 solar masses
I hope that's help !
The sky is in the earth but space is all around of the galaxy....