Answer:
4. When the suffix begins with a vowel, drop the "e" on the main word and add the suffix.
Explanation:
The last one is the best answer because, it concisely discribes the referenced spelling rule in relation to all situations rather than just the one given as an example.
Answer: there is an error in sentence 1.
It should be:
With sincerest and warmest regards
What language is this? Russian >.<
Readers can learn that it's important to cite and explain what you're citing
