Answer:
Mob.
Step-by-step explanation:
A connotation of a word refers to the indirect meaning, the suggested meaning of a given word. In short, we can say the connotative meaning of a word is the idea that a word implies or suggests.
In the given line, the word "crowd" is used to refer to the group of tourists on the bus. A "crowd" generally refers to an unruly or disorganized group of people. So, to create a more negative connotation of the word, we can replace "crowd" with "mob" to refer to the negative meaning of a group of people. A "mob" generally refers to a group of people who are intent on making or creating trouble, disturbance.
Thus, the correct answer is mob.