Read this excerpt from the poem "The Missing Books":
Detective, sidekick, both confused,
Sandra, for the stakeout, used
Clear powder to cover the box,
While Dennis hid, eyes like a hawk's.
When Sandra left, he heard a squeak,
The bang of books. He dared to peek.
What does the simile eyes like a hawk's mean as it is used in the poem? (2 points)
a
Free
b
Invisible
c
Observant
d
Puzzled