Explanation

Eggs are considered a complete protein source,

They contain all the essential amino acids needed by the human body

A single egg can provide around 6-7 grams of protein. 

Banana:

A medium banana contains approximately 1 gram of protein. 

Apple:

Apples are very low in protein, containing only about 0.5 grams per serving. 

Cucumber:

Cucumbers are also extremely low in protein, with only around 0.3 grams per serving