The last one fk the 20 word minimum btw
In the first sentence, the "he" is a nominative as it is a subject.
In the second sentence it is an object as the form "me" is actually "I", but "i" is a nominative form and "me" is an objective form.
In the third sentence "Us" is also used in objective form as "us" is an object of an action by "my sister".
The answer to your question would be the second option; "The pursuit of knowledge should include respect for moral boundaries".
Apple is more user friendly, Android is for more geeky people.
He seems unaware that his decisions are the cause of all of the problems
