The word their in paragraph 2 refers to _______.

a. Firstly, our planet faces many challenges, so I’ve started using reusable bags and bottles, turning off unused lights, and using energy-efficient appliances to reduce waste and save energy.

b. I’ve also started supporting local businesses that focus on eco-friendly products and practices.

c. In conclusion, I believe these small steps can lead to a big difference, and I’d love to hear how you’ve been living more sustainably.

d. Dear John, I hope this letter finds you well. I wanted to share my thoughts on living more sustainably, as it has become increasingly important to me.

e. Secondly, I’ve been using public transport more often and planted a few trees in my garden to help improve air quality.

f. Best regards,

Sarah