Select the most appropriate option to fill in the blank.

Sometimes, even one good ________ can make a big impact on both the person doing it and the person receiving it.

deed

The most appropriate option to fill in the blank is deed.

The word "deed" means an act of kindness or generosity. In this sentence, the speaker is saying that even one small act of kindness can make a big difference in the lives of both the person doing it and the person receiving it.

The other options are not as appropriate.

• "Deal" means to make a bargain or to settle a matter. It is not clear how a good deal could make a big impact on someone.
• "Dwell" means to live or stay in a place for a long time. It is not clear how a good dwell could make a big impact on someone.
• "Drill" means to train someone in a particular skill. It is not clear how a good drill could make a big impact on someone.