Which shows the correct use of a semicolon to combine sentences? a. in 1876, philadelphia held a world’s fair; edmonia lewis sent her sculpture to be exhibited there. b. the city of pompeii was built close to a volcano; when volcanoes erupt, they shoot ash into the sky. c. french settlers first came to canada in 1604; the weather was cold and it was hard to grow food. d. in 1845, frederick douglass published his autobiography; it became a bestseller.