Select the most appropriate option to fill in the blank.

I looked at her face and found she was getting disturbed. I decided to drop that ________.

subject 

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

The sentence is about someone who is disturbed by a certain topic. The speaker decided to drop that topic because they didn't want to upset the person.

The other options are incorrect.

• Product does not make sense in this context.
• Chance does not make sense in this context.
• Pride does not make sense in this context.