Can someone please help me with LOE? Explain!!

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My professor wants us use this site page 23 to rank our research http://samples.jbpub.com/9781284043297/9781284038705_CH01.pdf

I am struggling so bad and would love if someone please could help!! I have a RCT with 29,000 patients but because the study was only done in one setting I decided on level 2

I have a quasi-experiemental study that is a replication study. Has 4,000 patients in the study and has a control group. I can't decide but I am leaning towards level 3.

Honestly this system is really confusing to me. I feel like I don't know enough about research to be able to label them. Any input would really help