How many camera does this smartphone have?

• C. camera
  (It should be cameras to match the plural form needed with "How many.")

Do this tablet have a long battery life?

• A. Do
  (It should be Does because the subject "tablet" is singular.)

Why do you use your phone for?

• D. for
  (The sentence should end with "Why do you use your phone?" without "for.")

How many does the latest model cost one?

• C. does
  (It should be How much because "cost" should be used with "How much" for price.)

Does this laptop has the same storage space as that one?

• B. has
  (It should be has changed to have to match the auxiliary "Does.")