Circle the correct options

Ex1 :Circle the correct options.
1.......................... were the biggest wirefires?-They were in Siberia ,Russia.
A. Which                B. How               C. What               D. Where
2..........................was the worst avalanche ? - It was in 1970.
A. Which               B. When              C. What               D. Why
3.........................was the drought ? - It lasted two years.
A. How wide         B. How tall             C. How long            D. How heavy
4...................houses did the typhoon damage ? - 20, 000 houses.
A. How wide             B. How much           C. How long           D. How many
5................damage did the flood cause ? 
A. How wide           B. How much          C. How long          D. How many