A random sample of 311 medical doctors showed that 135 had a solo practice. As a news writer, how would you report the survey results regarding the percentage of medical doctors in solo practice? What is the margin of error based on a 90% confidence interval? Group of answer choices

a.) A recent study shows that about 57% of medical doctors have a solo practice with a margin of error of 4.6 percentage points.

b.) A recent study shows that about 43% of medical doctors have a solo practice with a margin of error of 2.3 percentage points.

c.) A recent study shows that about 57% of medical doctors have a solo practice with a margin of error of 2.3 percentage points.

d.) A recent study shows that about 57% of medical doctors have a solo practice with a margin of error of 9.2 percentage points.

e.) A recent study shows that about 43% of medical doctors have a solo practice with a margin of error of 4.6 percentage points.