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A dash is a mark of separation stronger than a comma, less formal than a colon, and more relaxed than parentheses. Unlike other forms of punctuation, the dash does not have one specific usage. when you want a phrase or another part of the sentence to have extra emphasis, a dash may be used. Take a look at this sentence:
There are three things every repairman must have: a screwdriver, a hammer, and a saw.
In this sentence, a colon has been used. The writing seems to be formal. In addition, the writing seems to NOT need any extra emphasis.
Look at the following sentence:
The only thing Tony could doâ€”if he could do anything at allâ€”was to sit and wait for the test results to come in the mail.
In this sentence, dashes are used because it seems informal and the clause inside the dashes needs some emphasis. The emphasis is added in order to show that Tony could do nothing in this situation. The writer could have used parentheses, but parentheses may have been too formal for this situation.
Here in the question the author is introducing bees to put more emphasis on his statements against white shark, the man-eater of the movies so dash should be used here
Checked my notes on the hyphen, and I am pasting it for your reference.
Hyphens are used for prefixes like ex-, self-. Hyphens are used in compound numbers like forty-five, and with fractions used as adjectives.
Right: A two-thirds vote was necessary to pass the law
Wrong: Only two-thirds of the students passed the final exam
Hyphens are used with a compound adjective when it comes before the word it modifies, but not after the word it modifies.
Wrong: The arguments continued into the night with no-holds-barred
Right: The no-holds-barred argument continued into the night
Hyphens are also used to emphasize a point being made in the sentence.
Ok!! With regards to the answer choices.
As it is possible to count the number of shark attack victims, fewer is preferable to less. Between B and E, "fewer than (what?) have been" has no clear referrent. fewer than what??
D is more wordy, and E conveys the same meaning using "fewer" words.