Select the most appropriate meaning of the underlined idiom in the given sentence. "Just  add a bit of cheese to your pasta and Bob's your uncle!" Reena suggested to me over dinner last night.

It becomes easily and quickly achievable 

The most appropriate meaning of the underlined idiom in the given sentence is it becomes easily and quickly achievable.

The idiom "Bob's your uncle" is a British idiom that means that something is very easy to do. It is often used to describe a simple solution to a problem.

In the given sentence, Reena is suggesting that adding a bit of cheese to the pasta will make it taste better. She is using the idiom "Bob's your uncle" to emphasize how easy it is to make the pasta taste better.

The other options are incorrect:

• It changes the appearance: This is not the meaning of the idiom "Bob's your uncle."
• It ruins everything: This is the opposite of the meaning of the idiom "Bob's your uncle."
• It changes nothing: This is not the meaning of the idiom "Bob's your uncle."