Which sentence uses pronouns correctly?

a.
she was the first woman to win an olympic gold medal.

b.
some of the best athletes in the world are them.

c.
later, her and him went on to win other awards.

Which sentence is written correctly? a. it's too bad its raining, i wanted too go for a swim. b. its too bad its raining, i wanted to go for a swim. c. it's too bad it's raining, i wanted to go for a swim. d. it's to bad it's raining, i wanted too go for a swim.