Answer: Positive punishment, punishment by application.
Step-by-step explanation:
In operant conditioning, positive punishment refers to presenting an unfavorable or aversive outcome after an undesirable behavior is elicited by the person that will receive the punishment, in order to decrease said behavior.
In this case, Richard behavior of wearing innapropiate clothes for his gardening work has changed due to positive punishment. (Trimmer cutting his ankle).
In conclusion, using operant conditioning terms, this is an example of: Positive punishment.