A student examines the vertical oscillation of a mass attached to a spring. The student draws the mass down from its equilibrium position P and then lets it go so that it oscillates vertically. The student then carries out the instructions below to determine the period of the oscillating mass. 1. Time 10 complete oscillations. 2. Divide the reading on the stop-watch by $10$. 3. Start the stop-watch as the mass passes upwards through point P. 4. Stop the stop-watch. What is the correct sequence of these instructions?
- A$1 \rightarrow 3 \rightarrow 4 \rightarrow 2$
- B$3 \rightarrow 1 \rightarrow 4 \rightarrow 2$
- C$3 \rightarrow 4 \rightarrow 1 \rightarrow 2$
- D$4 \rightarrow 3 \rightarrow 2 \rightarrow 1$