Correct Option: A

fasten (Verb) : to close or join together the two parts of something ; to become closed or joined together ; do up
loosen (Verb) : to make something less tight or firm; to become less tight or firmly fixed; slacken
accelerate (Verb) : to happen or to make something happen faster or earlier
delay (Verb) : not to do something until a later time ; defer ; hold up
paste (Verb) : to stick using a glue ; to copy or move text into a document from another place or another document