Regression, does anyone can help to solve this problem?

CFA Level I Quant
#1

Mr. WMI is given the following regression equation:
% Sales Growth = b0 + b1 GDP
% Sales Growth = 6,253 + 0.7 GDP
Where:
(Standard deviation b0) Sb0 = 1.78
(Standard deviation b1) Sb1 = 0.21
(Standard Error of Estimate) SEE = 2.79
At the 95% confidence level, it is estimated that the population regression coefficients will be at intervals
A. -0.51 until 2.14

B. 0.35 until 1.05

C. 0.61 until 0.84

D. 0.28 until 1.12.

#2

The formula to use is:

b_1 \pm t_{\alpha/2, n-1} s_{b_1}