Which  two  elements from the advertisement "the opportunity of a lifetime" could the speaker of "voluntourism: an opportunity too good to be true" use to support the point that voluntourists often lack the skills and proper motivation, causing more harm than good?
a)  the line "if you've always wanted to make a difference, here's your chance."  b) the picture of the boy getting access to clean, running water  c) the question "do you have a passion for travel? "  d) the statistics that reveal the need for clean water, schools, and families  e) the words "the only qualification necessary is a desire to ! "

i believe the answer is perspective

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.