What was unknown to scientists during Wegener’s time

I have answers

1.B. Earth’s crust is made of plates that move.
2. B. Africa and South America
3. A. subduction
4. D. Pangaea
I got 100%
This is only for connexus students

The answer is b got 100%

The concept of plate tectonics was unknown to scientists during Wegener's time.

NO Thier right i got 100%

I don't know I'm asking you the question

crystal is right i got 100%

but don’t chose an answer that’s at the b place cuz for some ppl it changes it up just use the word answers
sry if that’s confusing

the answers that @Crystal are wrong for connexus quick check 6th grade