The hostages were held by iran during the presidency of

Jimmy Carter, who was the main national authority between 1977 and 1981

Explanation:

The ¨hostage situation¨ happened in 1979, at the middle of Carter´s presidency.

Was cataloged as a diplomatic standoff, antagonistically involving the United States and Iran. The conflict was originated when a large group of Muslim students who supported the Iranian Revolution invaded the US embassy located in Iran, posteriorly the group took as hostages US citizens and functionaries.

President Carter´s always had a critic position against this event, referring to it as a ¨blackmail¨ scenario and cataloged the students as ¨sons of anarchy and terrorism¨.

a- all cells come from pre-existing cells

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.