Answer:
The correct option is 4. Tanisha wrote an equation equivalent to Mrs. McAlister's.
Explanation:
It is given that Mrs. McAlister wrote an equation

and asked students to write an equivalent equation.
Combine like terms having same sign, to simplify the given equation.


Now, again combine like terms.

The equation 9t=8 is equivalent to the given equation. Tanisha wrote an equation equivalent to Mrs. McAlister's.
Therefore, the correct option is 4.