Artificial sweeteners are chemicals that offer the sweetness of sugar without as many calories. they are often used as part of a weight-control plan. people with diabetes may use artificial sweeteners because they make food taste sweet without raising blood sugar levels.

artificial sweeteners are the subject of debate: some think they cause health-related problems when used in excess. one artificial sweetener, aspartame, is not safe for people who have the rare hereditary disease phenylketonuria (pku).

while proponents of artificial sweeteners claim they are a good thing for diabetics, critics point out that, despite the recent development of artificial sweeteners, diabetes is actually on the rise. this probably means that
a) not enough diabetics are using the artificial sweeteners.
b) artificial sweeteners are actually causing more people to develop diabetes.
c) despite the development of artificial sweeteners, many people do not use them.
d) the risk of other complications due to the artificial sweeteners is the more serious issue.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

wegner's theory did not explain how the continents could move

explanation: