One way to punctuate a compound sentence correctly is to join the two independent clauses with a comma.
a semicolon.
a comma and a subordinating conjunction.
a semicolon and a coordinating conjunction.

hwhajaknendoalwne beus

second one- because has facts and not opinion

i think continuous as the stars that shine and twinkle on the milky way, they

stretched in never-ending line along the margin of a bay; ten thousand saw

i at glance, tossing their heads in sprightly dance.

i believe your answer would be d. matt saw the lost cat, and he looked for its owner.