A. What did we study?

 We studied about musical museum. ✔​

B.1.Who are that women?

=> Another way: Your sentence is okay and this is another way of saying it. 

Who's that?​​

=> Corrected : The sentence is corrected grammatically. 

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     2. That is Sim Chung. 

​(Capitalization)

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     3.Here is my home and This is family picture

​        => Another way: Your sentence is okay and this is another way of saying it.

         This is my home and this is my family.​​

         => Corrected : The sentence is corrected grammatically. 

​