Correct answer is B.
According to Clark and Wheelwright, if a person is working on 2 independent tasks then if he/she is blocked on one task then he/she can perform the switch to the second task. Beyond two task his/her productivity decreases. Productivity is 80% while doing 2 independent tasks and 70% while doing 1 task.
Post queries : Queries
Tips/Tricks/Cheatsheet to master PMP Exam and Concepts : Youtube Channel
PMP/Agile Useful Resources : PMP/Agile Resources
World of Project Management : Mobile App
Pass PMP in the First Attempt : PMP Strategy
All PMP Question & Answers: Question & Answers
Revise PMP & Agile Concepts: PMP Concepts
PMP Tips & Tricks: PMP Tips & Tricks
PMP Knowledge Area & Agile based Quiz:
20 Questions Challenge 50 Questions Challenge
Study Groups: Facebook Whatsapp Telegram