Which of the following is an example of passive income?
a. receiving money from selling stocks
b. receiving royalties from writing a book
c. making money from selling a motorcycle
d. making money by getting paid a salary

Option B is correct, i.e. Receiving royalties from writing a book.

Step-by-step explanation:

Active income is the receivables when you are actively involved in some activities and get compensated for your man-hours.

Passive income is the receivables when you are not active into any activity and still gets some monetary benefits from it.

A. receiving money from selling stocks; It requires your direct involvement in the transaction.

B. Receiving royalties from writing a book; It does not require your direct involvement.

C. Making money from selling a motorcycle; It requires your direct involvement in the transaction.

D. Making money by getting paid a salary; It requires your activeness in the job.

Hence, option B is correct, i.e. Receiving royalties from writing a book.

The correct answer is B.