The suffixes -able, -ing, and -ment can be added to the end of the word replace. for which of the following do you need to drop the final e before adding the suffix? a.) replace + -ing b.) all of the above c.) replace + -ment d.) replace + -able

A: replacing

Explanation:

 The word replacing is formed by dropping the final E and adding the suffix ing. With some exceptions, the  spelling rule indicates that we should drop the final E  of a word  when we need to add a suffix that begins with I  (ing) or al (surviv + al); (replac + ing.) For suffixes ment and able  the E  is not dropped: replacement; replaceable.

replace+ing

Explanation:

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elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.

this is a good question! i'll do some research and come back when i have the answer!