单选题：根据下列短文，回答题。 The first rule stepping up our luck is to look f

根据下列短文，回答题。
The first rule stepping up our luck is to look for variety．More variety will result in a richer life with more opportunities．The more varied life is，the more likely that unexpected combinations of events will occur，giving us the chance to improve our situation．Being able to change is the best way to survive in changing，unpredictable times．
When we are searching for something，like a pair of lost eyeglasses，it isn't a good idea to al．ways follow the same pattern of search．Searching for happiness is like that as well．Be flexible．Learn from your mistakes．Try Jots of different possibilities．
Variety is necessary for happiness．No matter how rich our lives may seem，if they consist only of expected events and repetition，boredom steps in．We find pleasure in the unexpected and the surprising.Saying yes to uncertainty adds pleasure to life and contributes to our luck．Sometimes it seems easier，however，to use our strength to build walls to try to protect ourselves from uncertainty．We buy life insurance，household insurance，car insurance．We’work hard and put money aside．But all this planning can’t guarantee safety．We need to find the courage to welcome uncertainty．
Each of us should find one action that will increase variety：subscribe to a new magazine，take a different route to work，sign up for a night．school course．Then focus on its positive results-This positive reinforcement．together with the pleasure of sensing the power in doing what we want to，should give us the courage for the next act．
Accepting ourselves exactly as we are at this present moment provides the courage to move for-ward.Believing that all our choices in the past were the best we could have made at the time flees us from regret and reinforces our belief that we are as good as we can be at this moment．The best preparation for the future is self-acceptance in the present．Self-acceptance and trust in people are the foundations of confidence and courage．
Self-acceptance，courage and action don’t guarantee good luck，but they do guarantee a richer and fuller life．
From the text we learn that__________． A．variety guarantees happiness
B．varied life relies on good luck
C．opportunities go before variety
D．adaptability is the key to survival