The word omit means that something has to be left out. The lowest scorecard will be omitted is a sentence that contains the correct word usage.
The word emitted means to produce or voice, while the word omitted means to leave or forget something. Omit means excluding something either knowingly or forgetfully.
In the first sentence, the use of the word omit, with respect to the alarm is incorrect and should be replaced by emitting, in the third statement the word emit should be replaced by omitting as chapters are left out.
In the fourth sentence emitted should be replaced by omitted as graphics are removed and are not produced.
Therefore, option 2. the teacher will omit the lowest scorecard is the correct sentence.
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