Yes 2♣ is fine. Now I am torn cause I don't know the opps agreement on 1♦ opening call and Partner's call could be natural In any event the possible calls look like 3♠, 4♣, 4♦, 4♠, 5♣, and 5♦. At this point since I am in an uncertain position I make the call with the most flexibility, 3♠.