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Given:
A number is subtracted from -2.5, This difference gives a final positive number.
The objective is to find the number.
Explanation:
Consider the unknown number as x.
The difference between the two numbers can be represented as,
[tex]-2.5-(x)=\text{positive value}[/tex]Since, the required result is a positive number and the given operation is difference, then the value of x should also be a negative number lesser than (-2.5).
So the only option which is lesser than (-2.5) is (-5.2).
Check:
[tex]\begin{gathered} -2.5-(-5.2)=-2.5+5.2 \\ =2.7\text{ (positive number)} \end{gathered}[/tex]Hence, option (A) is the correct answer.