Correct answer: (c) Guava
Explanation
- A
Custard Apple
Custard apple (sitaphal/sharifa) has local cultivars, but Sultana, Gulabi and Kali Champa are not its standard named set. This fruit is therefore not the keyed crop.
- B
Orange
Orange and other citrus have many Indian varieties (Nagpur, Khasi, Coorg), not this trio of names. Do not file Sultana or Kali Champa as orange.
- C
Guava
(c) Official key: This paper keys Sultana, Gulabi and Kali Champa as varieties of guava. Among custard apple, orange, guava and grapes, the stored fruit is guava. Honour that official matching.
- D
Grapes
Grapes commonly carry the name Sultana (seedless) and several coloured table types, so students often pick grapes. Grapes are not the official key here. Do not let the familiar Sultana-grape link overwrite guava.
Summary. Official key is (c). The stem lists Sultana, Gulabi and Kali Champa as regional fruit varieties. The Commission keyed guava, not grapes, orange or custard apple. Sultana-as-grape is the main trap. Keep the stored fruit name. The official letter is guava.