Historians make interpretations about events based on novels based on the past.
evidence they collect.
the opinions of journalists.
interviews with citizens.

A. evidence they collect because if you think about it "evidence" kind of includes all the choices below A.

Explanation:

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angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°