Understanding the benefits of an activity can
a. increase your motivation to continue doing it.
b. decrease your effectiveness at getting those benefits.
c. decrease your chances of becoming injured doing it.
d. none of the above

The correct answer is a) increase your motivation to continue doing it

Explanation:

The best example for this announcement, is when your friends are playing a game that you don´t understand and you don´t know how to play it.

When they invite you and explain how to play, and show you the benefits to play or the benefits of doing that activity, immediately you motivate and you want to play with them.

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.

c.

clarify customers’ doubts only when asked.