What came before the big bang is one of the primary unanswered questions about the origin of
galaxies
life
earth
the universe
the solar system

The big bang theory describes the origin of the Universe - so the theory of the Big Bang, together with what came before it is a part of the study about the Universe- so the correct answer is "the universe".

Some people hypothesize that there was another universe before the Big Bang, and some that there was nothing.

Icant awnser the qustion bc u have the planets not listed

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.