Answer: The correct equation is (B)

Step-by-step explanation: Given that the price of Alumina stock decreased from 29 to
.
We are to select the correct equation that represents the above statement.
Since the price of Alumina has been decreased, so we must have to subtract something from 29.
Let, the price by the which the cost of Alumina is decreased be represented by 'X'.
Then, according to the given condition, we can write

Thus, (B) is the correct equation that represents the given situation.