Which MOST CLOSELY identifies a theme in this passage? A) Regret is destructive and leads to anger and hostility.
B) We must learn from our mistakes and make amends for all past errors.
C) It is better to think about future plans than to focus on past regrets.
D) It is better to express emotions privately than to communicate them publicly.

B)

Explanation:

It is the theme of the passage.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: