Answer:
Step-by-step explanation:
(A) The given equation is:

Upon solving the above equation, we get



Thus, the value of c is 5 and the option (C) is correct.
(B) The given expression is:

Upon solving the above equation, we get

which is not possible, therefore there are zero solution of the given equation.
Hence, option (A) is correct.
(C) The given equation is:

Upon solving the above equation, we get
Step 1. 
Step 2 
Thus, option A is correct.
(D) The given equation is:

Upon solving the above equation, we get
⇒
⇒
Hence, option (C) is correct.
(E) The given equation is:
⇒
⇒
⇒
⇒
Hence, option C is correct.