Final answer:
Volcanic eruptions and dust blown by the wind are sources for both carbon dioxide and particulate matter, whereas sea spray is not a significant source of CO₂. Hence, both volcanic eruptions and windblown dust fit the criteria.
Step-by-step explanation:
The question asks, "Which of the following are sources for both carbon dioxide and particulate matter?" The answer includes volcanic eruptions, dust blown by the wind, and sea spray from the ocean. These are all natural sources that release various gases such as CO₂, SO₂, and others, as well as particulate matter into the atmosphere. Volcanic eruptions are well-known sources of CO₂ and particulate matter, as they release these substances from deep within the earth. Windblown dust is also a contributor to atmospheric particulates, though it may not be a significant source of CO₂.
Sea spray does involve the release of particulate matter, primarily salt and biological materials, but it does not significantly contribute to atmospheric CO₂ levels. Therefore, the option that identifies both volcanic eruptions (I) and dust blown by wind (II) as the sources of CO₂ and particulate matter but does not include sea spray (III) is the most accurate answer.