Can someone answer 13-18 pls not 20

Which of the following is a good strategy when it comes to desserts

Which direction does the energy flow in this energy pyramid ?

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.