The major themes of the 19th National Congress of CPC are: staying true to the mission, ____, holding high the great banner of socialism with Chinese characteristics, making a decisive victory for a well-off society in an all-round way, winning the great victory of socialism with Chinese characteristics in the new era and making unremitting efforts to realize the Chinese dream of the great rejuvenation of the Chinese nation.
选项：

A: Moving on
B: Keeping the mission firmly in mind
C: All the time
D: Forging ahead