In a school within an unimmunized cohort of 100 children,I child developed measles on January 1st.Following this,35 children developed measles of which 3 cases occured on january 3rd and the remaining 2-3 weeks later.Find out the secondary attack rate

• A. 0.35
• B. 0.333
• C. 0.32
• D. 0.365