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I thought C cause the back of the train moves towards the light but idk

It's definitely age. A globular cluster is defined as a group of old stars. Not in the syllabus but I think the idea was to get there by process of elimination.

For the last part of 14a I wrote the answer at the very start then spent probably 15 minutes trying to simplify it and equate it with part iii cause I thought thats what it wanted, but would I still get the marks for that.