Which of the number (not digits) should be interchanged in the given equation to make it mathematically correct?
$$12 \div 3 − 2 + 5\times 4 = 23$$

In given series $$\frac{12}{3}-2+5\times\ 4=23$$

A. 3 and 4
$$\frac{12}{4}-2+5\times\ 3=23$$

$$3-2+5\times\ 3=23$$

$$1+5\times\ 3=23$$

$$1+15=23$$

$$16=23$$

B. 3 and 2
$$\frac{12}{2}-3+5\times\ 4=23$$

$$6-3+20=23$$

$$3+20=23$$

$$23=23$$

C. 3 and 5

$$\frac{12}{5}-2+3\times\ 4=23$$

$$2.4-2+12=23$$

$$0.4+12=23$$

$$12.4=23$$

D. 4 and 5
$$\frac{12}{3}-2+4\times\ 5=23$$

$$4-2+20=23$$

$$2+20=23$$

$$22=23$$

Hence option B is correct answer.