Look at option A again. When t=0, r=6i+8k, which does not meet the meaning of the question, so A is wrong.

When examining option B and t=0, r=8k, which satisfies the meaning of the question.

Look at the C option again. When t=0, r=0, which is not in line with the meaning of the question, so C is wrong.

Look at the D option again. When t=0, r=6i+ 16j+8k≠8k, which does not meet the meaning of the question, so D is wrong.

Re-analysis of velocity vector;

Option a, the velocity vector is: v= 16j.

Option b, the velocity vector is: v=6i+ 16tj.

Option c, the velocity vector is: v=6i+8j+8k.

Option d, the velocity vector is: v=0.

When t=0, only option B meets the meaning of the question: vo=6i.

Re-analyze the acceleration vector:

The acceleration vectors of a, c and d are all zero, which does not conform to the meaning of the question.

The acceleration vector of B is 16j, which is in line with the meaning of the question.

On the whole, the correct answer is B.