Answer: B. Avoided distractions.
Explanation: Isaac by avoiding distractions that came in by way of text messages and emails from his coworker would have avoided the compliant from his supervisor that he was on his phone instead of working on the problem with the computer. But choosing to reply text and emails, Isaac probably had lost focus on his activities thus making him either finish his work in less than appropriate time or not as effectively as he would have done had he not been distracted leading to the compliant.