To solve this problem, we will first see what is actually happening in this reaction.
Then we look at it with the help of the reaction and finally, we will analyze the final product.
So let's understand that the reactants are phosphonium and sodium hydroxide and by heating these we get phosphine gas, water, and sodium iodide.
The reaction is below :
PH4I+NaOH→PH3+H2O+NaI
So, this is the final reaction of the given half-reaction. So, the correct answer is phosphine gas.
So, the correct option is A.
Method used for separation of mixture of products (B and C) obtained in the following reaction is: 
What is Microalbuminuria ?
The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.