Based on the premise "To the north and west are the ancient sites of Malahide Castle, the evocative hill of Tara, and the long barrows of Knowth and Newgrange.", can we conclude the hypothesis "Malahide castle is the oldest site in the area, older than the barrows or even the hill of Tara." is true (see options)?

OPTIONS:
a). yes
b). it is not possible to tell
c). no
b).