(25 points) what is the purpose of this paragraph from a speech about solar energy?

the idea of harnessing the power of the sun is not a new one. as far back as the 1700s, a swiss physicist named horace-bénédict de saussure created the first solar oven. more recently, solar panel use steadily grew in the 1970s and 1980s in cars and homes around the world. however, the use of solar panels appears to have lessened over the past few decades. this trend is unfortunate because this energy source has extraordinary benefits. solar energy is renewable, sustainable, reliable, and cost-efficient. shouldn't we all consider investing in this valuable natural resource?

a.
to inform the audience about the history and origin of solar power
b.
to persuade the audience to start using solar power more frequently
c.
to convince the audience that solar power is the most profitable form of energy
d.
to instruct the audience about how to use solar power efficiently