Your objective is to determine that nonrecurring purchases, initiated by various user organizations, have been properly authorized. if all purchases are made through the purchasing department, to which of the following documents should you vouch purchases?
a. purchase requisitions.
b. invoices.
c. receiving reports.
d. purchase orders.

A. Purchase requisitions.

Explanation:

A purchase requisition is a document initiated by the user department or the store officer notifying the purchase department of the need to purchase materials needed either in the production unit, shop floor or store.

In order to ensure that the request for material or inventory items pass through the established internal control procedure, every  purchase requisition must pass through approval and authorization process.

answer; the correct answer to the above statement is (true);

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.