Directions: Read the short passages given below and answer the question that follows it.
Three airlines — IA, JA and SA — operate on the Delhi- Mumbai route. To increase the number of seats sold, SA reduced its fares and this was emulated by IA and JA immediately. The general belief was that the volume of air travel between Delhi and Mumbai would increase as a result.
Which of the following, if true, would add credence to the general belief?