A) the amount of English ships was less than their Franco-Spanish opponents, but the English fleet were victorious on account of their brilliant
"amount of" is wrong ,should be number if .fleet and were,SVA error
B) the amount of English ships was less than their Franco-Spanish opponents, but the English fleet was victorious on account of its brilliant
same as A, "amount "is wrong
C) the English ships numbered fewer than their Franco-Spanish opponents, but the English fleet was victorious on account of its brilliant
looks good
D) the English ships numbered fewer than their Franco-Spanish opponents, but the English fleet were victorious on account of their brilliant
fleet,were,their SVA error
E) the number of English ships was fewer than its Franco-Spanish opponents, but the English fleet was victorious on account of its brilliant
"its" is referring back to number of english ships. english ships had the opponents not the number
IMO C