(Weakly dominant strategy) (1) finding the weakly dominant strategy for each player (player 1 or 2)

(Weakly dominant strategy) (1) finding the weakly dominant strategy for each player (player 1 or 2) in the following game (the table is in the next page). The actions for player 1 are A, B or C. (2) Suppose there are only two bidders and each bidder?s valuation is identically and independently distributed according to the uniform distribution over [0,1]. Show that bidding truthfully is the weakly dominant strategy for each bidder in the second-price sealed-bid auction. How will the argument change if there are more than 2 bidders?