Which abbreviation correctly replaces the underlined words in the sentence?

the egyptian pharaoh popularly known as king tut was born around 1340 before christ.

a.
bc.

b.
b. c.

c.
b. c.

d.
b. c.

Some make-up removal products suggest shacking the solution to before using it. why would the manufacturers provide this suggestion a) the solution evaporates easily b) the solution separates naturally c) the solutes in the solution separte according to size d) the solutes in the solution separate due to magnetism.