Final answer:
The Green Gables Farmhouse and Signal Hill are National Historic Sites of Canada.
Step-by-step explanation:
The National Historic Site of Canada is a designation given by the Canadian government to places, buildings, and structures of national historic significance. Out of the options provided, both b) The Green Gables Farmhouse and c) Signal Hill are National Historic Sites of Canada. The Green Gables Farmhouse, located on Prince Edward Island, is the setting of the famous novel 'Anne of Green Gables' by Lucy Maud Montgomery. Signal Hill, located in St. John's, Newfoundland and Labrador, is historically significant as the place where the first transatlantic wireless signal was received.