What is the meaning of the underlined phrase in this excerpt from sonnet 126 by william shakespeare?
o thou, my lovely boy, who in thy power
dost hold time's fickle glass, his sickle, hour;

a. time is changeable and inconstant.
b. time and glass are immoral.
c. time is liable to break like glass.
d. time, like the glass or mirror, always reflects the truth.