Which of the following is an example of self-employed worker ?

Correct option is D

A woman selling fish in an urban market is an example of a self-employed worker. Self-employment involves running one's own business or working for oneself. In this case, the woman is independently engaging in a trade activity, which qualifies as self-employment. In contrast, an agricultural laborer working at a landlord's house, an Anganwadi worker, and a teacher in a school are typically employed by others and do not fall under the category of self-employed workers.