Statistical test for app

#1
The tool I'm building will show two (or more images) to an audience of 100 people. The audience will select one of the options.
For the customers of the tool, I want to be able to tell them something such as
"Option A was chosen x% more than Option B. With 95% certainty, Option A is your better choice. "
Where the "95%" level can change based on the results. For example, if the result was closer, the message would be:
"Option A was chosen x% more than Option B. With 78% certainty, Option A is a better choice. "
And if the results are super close, then a message such as
"Option A was chosen the similar amount of times as Option B. There's no clear winner here. "
I want the customers to be able to decide what level of confidence they're happy with to proceed with.

What test that I could apply here?