Answer:
B: I have deep concerns about the movement to increase organic gardening.
Step-by-step explanation:
The speaker is manifesting his desire to share his opinion on the organic gardening movement, after some consideration; and his conclusion is what makes him compeled to express some information. This doesn't mean he only intends to share his views on the latest news on organic gardening, or that he is unsure about it, but that he has a contribution to make.