Answer:
A. Decrease the price charged to vacationers and increase the price charged to business travellers.
Step-by-step explanation:
Elasticity is the responsive change in demand to price change. 
Elastic demand means demand change responds more to price change. Price & Total revenue are negatively related in this case. 
Inelastic demand means demand change responds less to price change. Price & Total revenue are positively related in this case. 
So, Airlines objective being Total revenue maximisation : 
- It should increase price for people with inelastic demand i.e business travellers, as price & total revenue are positively related in inelastic demand. 
 - It should decrease price for people with elastic demand i.e vacationers, as price & total revenue are inversely related in elastic demand.