Respuesta :
The sentence which best completes this conclusion is the following: Consider starting your own garden with some of your favorite vegetable seeds.
This is because the rest of the conclusion paragraph refers to benefits that gardening can offer. So, a concluding sentence which encourages the readers to start their own garden is the only relevant choice here. Choice 1 talks about the benifits of the sun exposure but it's not directly related to gardening. Choice 2 gives a very specific advice on pesticides which doesn't seem to be relevant at this point either. Choice 4 mentions some challenges that gardening has and so it cannot be used to finish a parapraph related to the benefits of gardening.