He was abstained . . . . . . . . salted food by the doctor. A. about B. from C. on D. of

The correct answer is B. from.

The word “abstain” means to refrain from doing something. In this case, the doctor is telling the patient to refrain from eating salted food. The preposition “from” is used to indicate that the patient should avoid something.

The other options are not correct because they do not make sense in the context of the sentence. The word “about” is used to talk about something. The word “on” is used to talk about something that is happening on a surface. The word “of” is used to talk about something that is a part of something else.

Here are some examples of how the other options could be used in a sentence:

• I am about to eat a salted pretzel.
• The book is on the table.
• The cup is made of glass.