People who …… on horses usually lose in the end. A. gamble B. play C. risk D. place

The correct answer is A. gamble.

To gamble is to risk money or other valuables on an uncertain outcome in the hope of winning more. When people gamble on horses, they are betting on which horse they think will win a race. The odds of winning a horse race are often very low, so most people who gamble on horses lose money in the long run.

The other options are not correct because they do not accurately describe the act of gambling. To play is to engage in an activity for enjoyment or recreation. To risk is to expose oneself to the possibility of loss or harm. To place is to put something in a particular position or location.