Two scientists completed 250 trials of an experiment. They also ran a computer simulation. They discovered that the computer simulation of the experiment
yielded different results than the experiment they had conducted. In science,
which of the following is the best action the scientists should take next?
A. They should repeat the experiment.
B. They should ask another scientist to replicate the experiment.
C. They should do nothing because the computer simulation is probably
wrong.
D. They should adjust the computer program so that the simulation matches
their results.

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.