A hemispherical earth mound of 3 meter diameter is proposed to be constructed in a children s park. If the proportion of soil and sand for the construction is 3:2, the estimated volume of soil in cubic meters is ________

• A. 6.15 to 8.30
• B. 3.15 to 4.30
• C. 4 to 5
• D. 4.15 to 4.30