The total number of students is: 20 + 14 + 12 + 4 = 50
No. of students with voice and texting: 12
No. of students with voice, texting and data: 4
None of the other plans have texting.
So the total number of students with texting as part of their phone plan is 12 + 4 = 16
Percent of students with textring is 16/50 = 32/100 = 32%
Answer: Option C - 32%