What can give working people information about their fields, including conferences and leadership opportunities in those fields? an extracurricular activity
a career and technical student organization
a professional organization
a cocurricular activity

a professional organization

Explanation:

A professional organization is also known as a professional association or professional body. It is founded by people of a particular profession to advance their interests. A professional organization exists to support people working in that profession for the public good.

A professional body facilitates communication, interactions, and connection between members. It promotes research and innovation to further the knowledge and skill in the profession.

answer; the inspector may have found some violation that could cause death or some kind of serious injury;

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.