The distance-time graph of a particle at time $t$ makes an angle of $45^{\circ}$ with the time axis. After one second,it makes an angle of $60^{\circ}$ with the time axis. What is the average acceleration of the particle?
- A$\sqrt{3}-1$
- B$\sqrt{3}+1$
- C$\sqrt{3}$
- D$1$
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