PLEASE HELP Explain why each choice is right or wrong.
Medical knowledge of mental disorders was far more limited than it is today.
b. People in the Middle Ages were more prone to sleepwalking than they are today.
C. People in Shakespeare's time knew nothing of emotional distress.
d. In the past, servants often knew more about medicine than doctors did.

Explanation:

B is wrong because that is just  weird random fact. C is untrue because Shakespeare wrote Romeo and Juliet . D seems unlikely but it could be true The answer might be A but you never put it in here i don't think.

answer; ///i believe the answer your looking for and the correct answer is (d); / he becomes very angry;

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.