Not every mouse trap is designed to kill mice, some only trap ...

[audragclark]

Not every mouse trap is designed to kill mice, some only trap them.
 
  A) mice; some B) mice, and C) no change

Question 2

Some early traps impaled, choked, or drowned mice, more recent inventions have
  electrocuted or gassed them.
 
  A) mice; whereas, more B) mice; more C) no change

[zoeyesther]

Answer to Question 1

A

Answer to Question 2

B