What books is most likely to be nonfiction from looking at the title a The Spy Who Came in Cold b Stranger Within c Exercise For All seasons d A summer Venice?

The most likely nonfiction book from the titles provided is c) Exercise For All Seasons.

Here's why:

* a) The Spy Who Came in Cold: This title strongly suggests a spy thriller, a genre typically classified as fiction.

* b) Stranger Within: This title could go either way, but the use of "within" suggests a more psychological or suspenseful narrative, again pointing towards fiction.

* d) A Summer in Venice: This title evokes a travel or memoir setting, which could be either fiction or nonfiction.

* c) Exercise For All Seasons: This title clearly indicates a book about fitness and health, making it the most likely nonfiction choice.

While it's not always possible to definitively determine genre based on a title alone, "Exercise For All Seasons" is the most straightforward and specific, suggesting a practical and informative book.