The correct answer is option 1: Guava. Guava is considered to be the richest source of vitamin C among the given options. Vitamin C is a water-soluble vitamin that acts as an antioxidant in the body and supports immune function, collagen production, and iron absorption.

Although other options like pineapple, orange, and tomato also contain significant amounts of vitamin C, guava stands out as the richest source because it contains more vitamin C per serving compared to the other options.

Pineapple is a good source of vitamin C but not as concentrated as guava. Similarly, oranges and tomatoes are also good sources of vitamin C, but guava has a higher vitamin C content.

It`s worth noting that the vitamin C content can vary based on factors like fruit ripeness, storage, and cooking methods. However, in general, guava is known for its high vitamin C content, making it an excellent choice to include in your diet to meet your vitamin C needs.