Answer:
Option (C)
Explanation:
Students having phone plans with texting = Students with plan of voice and texting + Students with plan of voice, texting and data
= 12 + 4
= 16
Total number of students with different plans = 20 + 14 + 12 + 4
= 50
Percentage of students using phone plans with texting
=

=

= 32%
Therefore, Option (C) will be the answer.