Answer: Choice A; argument is invalid; truth table is shown below.
Step-by-step explanation
The arrow indicates "if ... then ..."
So
means "If P, then Q" where we replace P and Q with their corresponding statements.
Based on this the answer is between A and B.
The second statement "We will have enough to paint the room" then narrows the answer to choice A
Here's a truth table

Notice how we have T, T, F in the third row. This is where we have all true premises, but they lead to a false conclusion.
This makes the argument invalid