The suffixes -ed, -er, and -ing can be added to the end of the word shop.

For which if the following do you need to double the final consonant before adding the suffix?

a: shop + -ed
b: all of the above
c: shop + -er
d: shop + -ing

For which of the following do you need to drop the final "e" before adding the suffix?

a: advise + -able
b: care + -ful
c: clue + -less
d: manage + -ment