B: I have deep concerns about the movement to increase organic gardening.
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 <em>he has a contribution to make.</em>
b. I have some deep concerns about the movement to increase organic
Explanation:
The idea of the speaker is to be heard. He or she wants to state something that he or she has in mind about Organic Gardening. To make something precise is to make it accurate. Right to the point. Instead of saying that you want to say something about it, you could just say that you're worried about the matter and after that, say why.
