Concept:A valid website address always begins with the correct protocol prefix, such as http:// or https://.Explanation:Check each option for spelling mistakes in the protocol part.A is incorrect because htpp:// is a misspelling of http://.B is incorrect because hppt:// is not a valid protocol format.C is incorrect because hhtp:// has the letters arranged wrongly.D correctly uses http:// followed by the domain waecgh.org.Hence, only option D is a valid website address.Answer:D.http://waecgh.org