What percentage of K12 students are children of immigrants?

What percentage of K12 students are children of immigrants?
 
  a. Less than 5
  b. 10
  c. 20
  d. At least 25

Question 2...

All of the following are ways that students are different except
 
  a. gender.
  b. culture.
  c. ethnicity.
  d. all of the above are ways that students are different.

Question 3...

All of the following are true of homelessness except
 
  a. homeless students are more likely to be held back a grade.
  b. over 2/3 of homeless parents are unemployed.
  c. 62 of children placed in foster care come from formerly homeless families.
  d. all of the above true.