Concept: In Islam, a traveller crossing a defined distance receives the concession to shorten prayers.
Explanation:When a Muslim travels beyond fifty miles, he is legally considered a traveller.
The rule for such a traveller is to shorten the four-unit obligatory prayers to two units.
Providing for the family is always recommended, but not the specific rule for this distance.
Saying all salat before the journey or reciting the Ma'udhatayn are not the required obligations for a journey of this length.
Thus, the correct action is to shorten the prayer.
Answer: A. shorten his prayer