Which word with a root ending in y and to each the suffix -ed has been added is spelled correctly A spyed B defyed C conveyed D ferryed?

Here's why:

* spyed is incorrect. The correct spelling is spied.

* defyed is incorrect. The correct spelling is defied.

* conveyed is correct, but it doesn't follow the pattern of a root ending in "y" and adding "-ed".

* ferryed is correct. The word "ferry" ends in "y" and the rule for adding "-ed" to words ending in "y" is to change the "y" to "i" and add "-ed".