midwinteroasis

So a lecturer of mine posted up this question in a lecture Q11. Below is an alignment of orthologous amino acid sequences from three species (A, B and C). Species C is the known ‘outgroup’. Are the sequences evolving in a clock like fashion? A: G E N M E E V L T I N A C E B: G E N E S E V I L A S S C R C: G E N E E E V I T I N A C E and that's all very well. Except I have no idea how to do that and when he posted the answer in the next lecture, I have no idea how that answer appeared. Which I shall show below A: S E C E N D S R D H A T D E A M E L B: S E Q A N C E R F N A N D G I M E S C: A E Q E N C E S F N A N D G A S R N I would be very grateful if anyone could provide me some insight to this. I'm pretty sure its not something difficult, just that my poor brain can't understand this.