Hi there,
The 2nd option looks best, but ideally it takes you more like 15 seconds not a minute!
In terms of being able to interpret charts/graphs effectively
1) Read the title - and understand it
2) Read the legends - and understand them
3) Remind yourself of the objective / hypothesis in the case, to see where this might fit
4) Find the differences - where does the line graph plummet or spike? Which column is a lot smaller or bigger than the others? Where does change occur? The differences are what matter
5) Talk outloud while interpreting - first, it helps you think and process your thoughts, second, it lets the interviewer provide guidance and course correct if needed.
Best Rote Practice
Rocket Blocks: https://www.rocketblocks.me/
Best Practice Strategy
1) Read the Economist (especially the daily graph and Financial Time frequently
https://www.economist.com/graphic-detail/2020/05/29/america-first
2) Ask case partners to focus particularly on your chart-reading skills (i.e. by providing you with cases with many charts) - Bain and Deloitte cases tend to be chart heavy