Due to his tours, he got to meet . . . . . . . . of people. A. a lot B. much C. little D. several

The correct answer is: A. a lot

The word “a lot” is used to refer to a large number of things. In this case, the speaker is referring to the number of people that the person met on their tours. The word “much” is also used to refer to a large number of things, but it is more formal than “a lot.” The word “little” is used to refer to a small number of things. The word “several” is used to refer to a few things.

In this case, the speaker is clearly referring to a large number of people, so the correct answer is “a lot.”