(A) Guava

Guava is considered one of the richest sources of vitamin C among fruits. It contains a high concentration of ascorbic acid, which is a form of vitamin C. While other fruits like oranges and pineapples also contain vitamin C, guava surpasses them in terms of vitamin C content per serving. Tomatoes, although a good source of vitamin C, are generally lower in vitamin C compared to guava.

The space agency that sent 104 satellites in a single mission in 2017 is the Indian Space Research Organisation (ISRO). The correct answer is (C) ISRO. ISRO's Polar Satellite Launch Vehicle (PSLV-C37) set a record by launching 104 satellites in a single mission on February 15, 2017.