pls tell the correct option

Firm-1 is the incumbent monopolist and firm-2 is the potential entrant into the market. Firm-2 moves first and chooses to "enter" or "not enter". If it does "not enter", then firm-1 gets 10 while firm-2 gets 0. If firm-2 "enters", then firm-1 chooses either to "fight" or "not fight". If firm-1 "fights", then firm-1 gets 6 while firm-2 gets -2. If firm-1 does "not fight", then firm-1 gets 8 and 4 firm-2 gets 2. Firm-l's strategy of "fight" is best interpreted as (a) acquiescence (b) a punitive action (c) a commitment (d) a non-credible threat