If Mario's Pizza and Angelo's Pizza Are Pizza Delivery Companies

If Mario's Pizza and Angelo's Pizza are pizza delivery companies in tacit collusion and Mario's Pizza launches a new advertising campaign that states that it will meet any competitor's price on a comparable pizza, Mario's Pizza might be tacitly signaling to Angelo's Pizza that they are willing to________.

A) lower their price
B) cut price is exactly half
C) raise their price
D) maintain current the price