Unit 5 chemistry edexecel help!!

WHY IS IT C I AM SOOOO CONFUSED PLEASE I AM BEGGING SOMEONE HELP ME!

Look at where the jump in IE is for each case.

A: Between 1st and 2nd
B: Between 2nd and 3rd
C: Between 7th and 8th
D: Between 6th and 7th

From this, you can deduce that A is in group 1, B is in group 2.

C could be a group 7 but the question states that there must be a transition metal. C is the most likely because the increase in IE is very steady and gradual which is characteristic to a transition metal. Transition metal has 4s orbital and 3d orbital and they are very close in energy level which result in such a steady pattern. With this argument it could be D too but there is another evidence that it is C. There is a mini jump between 2nd and 3rd for C which accounts for the change in 4s and 3d although they are very close in energy level it's still a different energy level.
Also I think C has a very low first IE for group 7 - first IE is supposed to increase across period so it is very likely that C is more towards left side of periodic table. D on the other hand has ridiculously high first IE for something in middle/left of the periodic table.

This is my best shot; I could be a bit off - I'm only Y12 so that should be someone who's more qualified to suggest the reasons.
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