The following equation is incorrect. Which two signs should be interchanged to correct the equation?
13−14÷30×7+15=13

Let us test the given alternatives to find which interchange balances the equation to yield 13:
Test Option B (− and +):
Replace − with + and + with −:

13+14÷30×7−15
This leads to fractional components (14/30), which doesn't resolve to 13 cleanly.

Test Option C (÷ and ×):
Replace ÷ with × and × with ÷:

13−14×30÷7+15
Applying BODMAS:

Division: 30÷7=
7
30
​


Multiplication: 14×
7
30
​
=2×30=60

Evaluate remaining parts:

13−60+15=28−60=−32

=13
Let us check Option D (× and −):
Replace × with − and − with ×:

13×14÷30−7+15
=
30
182
​
−7+15

=13
Let us carefully re-check standard alignment corrections or potential sign shifts where − and ÷ or alternative pairs are switched. Let's test interchanging − and + carefully with standard integer options:
If the question text contains alternate placement, option B or alternative checks align with traditional balance patterns. Let's test standard key assignment verification.