Qasr prayer is allowed in which situation?

Qasr prayer (shortening of prayers) is a significant concession in Islam specifically allowed for travellers (Musafir). When a Muslim travels a certain distance (typically around 48 miles or 80 km, though interpretations vary), they are permitted to shorten the four-rak'ah prayers (Dhuhr, Asr, Isha) to two rak'ahs. This is a mercy from Allah to ease the burden of travel and facilitate worship.

• When sick, one might adjust prayer posture but not necessarily shorten the number of rak'ahs.
• During Ramazan, Muslims fast, but Qasr rules are independent of the month.
• Therefore, "None of these" is incorrect.