According to the condensation theory, the most important factor for the formation of our planets was

a-the gravitational pull of the sun
b-the interstellar dust attracting heat away from the protosun
c-the process of nuclear fusion
d-the nebular cloud condensing

According to the condensation theory, the most important factor for the formation of our planets was d-the nebular cloud condensing. This is the most suitable options from given above.

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.