Example #11 - Second chance

Boards presented here are not about 'normal' bridge. If that were the case there would be no need for this blog in the first place.
So, we feel it's fair to give you a second chance - but this time based on the same information we're convinced Aruf based his action upon when this board was played. For a more realistic approach you might contemplate acquiring a second computer, placing the monitor next to the one you're using right now, and studying the hand record presented below on the new monitor.

You're sitting North, playing with a pick-up partner in a 12-board ACBL-sanctioned tournament on Bridge Base Online.
Bidding is based on standard 5-c major systems like sayc or 2/1, unless stated otherwise.

Dealer W Vul All Scoring MP Lead	♠ T94 ♥ AK9543 ♦ 86 ♣ J8
♠ 63 ♥ 86 ♦ AK94 ♣ AQ732		♠ AQ752 ♥ Q2 ♦ Q53 ♣ K64
	♠ KJ8 ♥ JT7 ♦ JT72 ♣ T95

West	North	East	South
1♣	1♥	1♠	2♥
p	p	3♥	p
4♦	p	5♣	p
p	?

Once you've made up your mind you can compare your solution with Aruf's action, presented in the final post about this board.