Analyze the stanza from Lewis Carroll's \"You Are Old, Father William\" poem and determine which metrical foot did Carroll use . \"You are old, Father William,\" the young man said,. \"And your hair has become very white;. And yet you incessantly stand on your head -. Do you think, at your age, it is right?\".
a) iambic
b) trochaic
c) anapestic
d) dactylic