The two sentences are:
1. It is easy to learn how to whistle.
2. Whistling a little tune is a great way to lift your spirits.
I think "pay attention to what helps you get through hard times" sounds relevant
The correct answer is C) Appropriate. Hope this helps.
Easiest topic is and email to a friend with a description of a favorite place to shop or a shopping website and recommending it
You should do all of the above!
Sunny~ ☺