Question

To open a tightly closed bottle, we often wrap the lid in a thick, rough towel because
(a) sweat and grease on our hands makes them slip.
(b) this prevents the bottle from breaking.
(c) this does not hurt our hands.
(d) friction between the lid and towel prevents it from opening easily.

Answer 1

(a) sweat and grease on our hands makes them slip

To open a tightly closed bottle, we often wrap the lid in a thick, rough towel because sweat and grease on our hands make them slippery.