The correct option is D Thomas Cook
Thomas Cook, sometimes called the world’s first travel agent, revolutionised the way the tourism industry functioned in the 19th century. One of his earliest ventures was organising a rail trip from Leicester to Loughborough for about 600 people. Later on, he organised a grand tour of Europe as well. As this type of ‘commercialised tourism’ was catching on, Cook established a travel agency and started selling various tourist tickets. This opened up new possibilities for the tourism industry.