Final answer:
The negation of the statement 'If today is not a weekend day, then tomorrow is Monday' is 'It is a weekend day today and tomorrow is not Monday'. Therefore, the correct answer is C) Tomorrow is not Monday.
Step-by-step explanation:
The given statement is:
If today is not a weekend day, then tomorrow is Monday.
We can represent this statement as:
If ~W, then M.
The statement is a conditional statement, where ~W represents 'today is not a weekend day' and M represents 'tomorrow is Monday'.
The negation of the conditional statement is represented as:
~(If ~W, then M).
This can be rewritten as:
~(~W or M).
By applying De Morgan's Law, the above statement can be simplified as:
W and ~M.
Therefore, the negation of the statement 'If today is not a weekend day, then tomorrow is Monday' is 'It is a weekend day today and tomorrow is not Monday'.
So, the correct answer is C) Tomorrow is not Monday.