I don’t think that any of the options are correct..?
Answer:
If the boys find anything interesting or unusual while digging, they're supposed to tell Mr. P or Mr. Sir. And if the Warden likes what they find, they'll get the rest of the day off with no more digging.
Explanation:
B) finally
Because your concluding your thoughts and wrapping it up
<span>Gulliver’s glasses may represent the ease with which the larger and powerful can protect themselves against the smaller and weaker.</span>