Sediments in sedimentary rocks are often
a) held together with natural cements
b) formed when atoms of melted minerals rearrange themselves
c) formed when lava erupts from a volcano
d) formed by magma trapped below earth's surface

Sedimentary rocks set up  through the discharge and freezing  of sediment which is transported by water and crystallize between sediment grains this procedure is called cementation.
therefore,
Sediments in sedimentary rocks are often held together with natural cements.
hence the right answer is A) held together with natural cements

Sediments in sedimentary rocks are often held togheter with natural cements.

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