How can data be calculated?

Which of the following had the greatest influence on opening the internet to the generly public

Michael has written an e-mail to his employees that describes a new product special that will be introduced to the customers next week. by taking time to make sure the e-mail is well written, logical, and organized, michael has made sure his message has the characteristics of a) effective communicationb) ineffective communicationc) barriers to communicationd) workplace communication

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)