What impact did the frequent business traveling and expansion of cities have on the hotel industry?

A. Steady growth and gaining popularity as time progresses
B. Lead to the merging of small hotels to form chain hotels
C. Training of personnel to manage various establishment and quality services
D. Improve meals and lodgment for traveller's
Which alternative are correct answers

All of the above: A. Steady growth and gaining popularity as time progresses B. Lead to the merging of small hotels to form chain hotels C. Training of personnel to manage various establishments and quality services D. Improve meals and lodgment for travelers.

B. Lead to the merging of small hotels to form chain hotels

C. Training of personnel to manage various establishments and quality services
D. Improve meals and lodgment for travelers