The boy was cured …… typhoid. A. from B. of C. for D. through

The correct answer is A. from.

The preposition “from” is used to indicate a source or origin. In this case, the boy was cured from typhoid. This means that he was no longer sick with typhoid.

The other options are incorrect because they do not indicate a source or origin. The preposition “of” is used to indicate possession or ownership. The preposition “for” is used to indicate a purpose or goal. The preposition “through” is used to indicate a means or method.

Here are some examples of how the other prepositions can be used:

• The boy is the owner of the toy.
• The boy is working for his father.
• The boy is going through a difficult time.