A. Allowing unlimited screen time on weekends as a reward for good behavior can lead to excessive screen time, which is not recommended. Screen time should be limited.

B. Encouraging educational programs and limiting screen time to 1-2 hours per day is a recommended practice. Educational programs can be beneficial, but screen time should be moderated.

C. Placing the television in the child's bedroom is not recommended, as it can lead to unsupervised and excessive screen time. The television should be placed in a common area where screen time can be monitored.

D. Allowing the preschooler to choose any television program without restrictions is not advisable. Parents should guide the child's screen time and choose appropriate, educational content.