When subjects were treated with adrug, their systolic blood pressure readings(in mmHg) were measured before and after the drug was taken. Results are given in the table below. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Using a 0.05 significancelevel, is there sufficient evidence to support the claim that the drug is effective in lowering systolic bloodpressure?

Before

161

189

188

159

167

206

183

200

210

195

179

158

After

146

155

179

163

177

176

144

161

179

176

147

159

In thisexample, d is the mean value of the differences d for the population of all pairs ofdata, where each individual difference d is defined as the systolic blood pressure reading before the drug was taken minus the reading after the drug was taken. What are the null and alternative hypotheses for the hypothesistest?

A.

H0: d0

H1: d>0

B.

H0: d0

H1: d=0

C.

H0: d=0

H1: d>0

D.

H0: d=0

H1: d<0