PLS HELP ASAP what is the equation for the line of symmetry for the function below?

y-1=-2(x+3)^2

A. x=3
B. x=-2
C. x=-3
D. y=7

I THINK ITS C BUT IM NOT SURE

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?