I am used . . . . . . . . such hardships. A. for B. from C. to D. at

The correct answer is C. to.

The preposition “to” is used to indicate a purpose or goal. In this case, the speaker is saying that they are used to experiencing hardships. This means that they are familiar with hardships and have learned how to deal with them.

The other options are not as appropriate in this context. The preposition “for” is used to indicate a reason or cause. The preposition “from” is used to indicate a source or origin. The preposition “at” is used to indicate a location or position.

Here are some examples of how the preposition “to” can be used in other sentences:

• I am used to getting up early.
• I am used to driving in the snow.
• I am used to working long hours.