Which two signs and two numbers should be interchanged to make the given equation correct?
$$54 - 45 \div 9 + 7 \times 11 = 14$$

We can check each of the options to get the correct answer.

Option (a) $$7\ and\ 54\ ,+\ and\ -$$

$$7 + 45 \div 9 - 54 \times 11 = 14$$

$$7 + 5 - 54 \times 11 = 14$$

This will not be the correct option. Because the given equation is not satisfied and get the negative value. 

Option (b) $$9\ and\ 11,-\ and\ \div$$

$$54 \div 45 - 11 + 7 \times 9 = 14$$

This will not be the correct option. Because the given equation is not satisfied and get the fractional value.

Option (c) $$54\ and\ 45,+\ and\ \times$$

$$45 - 54 \div 9 \times 7 + 11 = 14$$

$$45-6\times7+11=14$$

$$45-42+11=14$$

3+11 = 14

This will be the correct answer. Because the given equation is satisfied.

Option (d) $$45\ and\ 11,\div\ and\ \ \times\ $$

$$54 - 45 \times 9 + 7 \div 11 = 14$$

This will not be the correct option. Because the given equation is not satisfied and gets the fractional value.