A body of mass \(3 \mathrm{~kg}\) moving with a velocity \((2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+3 \hat{\mathbf{k}}) \mathrm{m} / \mathrm{s}\) collides with another body of mass \(4 \mathrm{~kg}\) moving with a velocity \([3 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-3 \hat{\mathbf{k}}] \mathrm{m} / \mathrm{s}\). The two bodies stick together after collision. The velocity of the composite body is

1. A \(\frac{1}{7}(4 \hat{\mathbf{i}}+6 \hat{\mathbf{j}}-3 \hat{\mathbf{k}})\)
2. B \(\frac{1}{7}(18 \hat{\mathbf{i}}+17 \hat{\mathbf{j}}-3 \hat{\mathbf{k}})\)
3. C \(\frac{1}{7}(6 \hat{\mathbf{i}}+4 \hat{\mathbf{j}}-6 \hat{\mathbf{k}})\)
4. D \(1(9 \hat{\mathrm{i}}+8 \hat{\mathrm{i}}-6 \hat{\mathrm{k}})\)