What changes should be made to correct this sentence from the second paragraph? by 1963, the sport was very popular this was shown by the high sales of skateboards. a. by 1963, the sport was very popular but this was shown by the high sales of skateboards. b. by 1963, the sport was very popular, this was shown by the high sales of skateboards. c. by 1963, the sport was very popular. this was shown by the high sales of skateboards. d. by 1963, the sport was very popular and this was shown by the high sales of skateboards.