A and B complete a work in 7 days. A alone can do it in 14 days. If both together can do the work in how many days?  Choose the correct choice from the following answers.
A) 4.6 days
B) 4.78 days
C) 5.65 days
D) 3.77 days
E) 5.75 days

Rationale: "1 / 7 + 1 / 14 = 3 / 14 14 / 3 = 4.6 days answer : a"
Answer: A