The answer to number three is true
An adverb phrase is two or more words that can act as an adverb. An example can be "as is I care" or "under the sea"
The tone - sentence b made it seem more secretive with its word choice (stranger, crept) the meaning is the same - in both a person is moving towards the door but the tone is more mysterious in the second sentence
The correct answer should be "From"
"To" usually precedes, however, it can be omitted, with "from" being the beginning of the memo.
