The average marks scored by Amit, Bimal and Candy in an examination is 84. If marks of Dorothy are now added, the average marks of the 4 students becomes 80. Ellora's score is 3 more than Dorothy. If Ellora's marks replace Amit's marks, than the average marks scored by Bimal, Candy, Dorothy and Ellora is 79. What is the score of Amit?

• A. 71
• B. 75
• C. 68
• D. 77