Which of the following interchanges of signs would make the given equation correct?
$$10+23-3\times 63÷7=70$$

Let us evaluate the options by substituting interchanged operators to find which one equates the left hand side to 70 following the BODMAS rule.
Test **Option C ($-$ and $\times$)**:
Replace $-$ with $\times$ and $\times$ with $-$ in the expression:

$$10+23\times 3-63÷7=70$$

Now evaluate using BODMAS:

1. Division: Evaluate $63÷7=9$

$$10+23\times 3-9=70$$

2. Multiplication: Evaluate $23\times 3=69$

$$10+69-9=70$$

3. Addition/Subtraction:

$$79-9=70$$

$$70=70(\text{LHS}=\text{RHS})$$

This matches perfectly. Therefore, interchanging $-$ and $\times$ makes the equation correct.