A and B complete a work in 4 days. A alone can do it in 8 days. If both together can do the work in how many days?
Choose the correct option:  A) 3.75 days  B) 3.99 days  C) 2.67 days  D) 2.98 days  E) 2.44 days

Rationale: "1 / 4 + 1 / 8 = 3 / 8 8 / 3 = 2.67 days answer : c"
Answer: C