Question

Why is disagreement among scientists important to the progress of science?

Facing disagreement forces scientists to prove their theories more conclusively?

Disagreement proves that no scientific theories are valid?

A scientific model is not useful unless every scientist agrees it is perfect?

Scientists do not learn new information when their hypothesis is proven to be incorrect?

Answer 1

The answer would be the first one.
If you make no mistakes, you don't learn.

Answer 2

A scientist give a theory on the basis of his thinking

but when other scientist go through it they might have some issues in it because they think differently

On this disagreement they try to think more deeper and find out the theory more conclusively

So here first option is correct