The sign that represents the number 20 in American Sign Language (ASL) is typically performed by extending your palm outward with the fingers together while making a "W" shape with the thumb. Since your description does not include a "W" shape or any indications of a counting method directly correlating to the number 20, it is challenging to directly identify it from the given options.
However, based on common ASL conventions, a fist with the thumb pointing up or an open hand with fingers spread cannot represent the number 20. The signs you've described are ambiguous. If none of them specifically meets the criteria for 20 in ASL (like having the preferred "W" shape), then it appears that a specific representation for the number 20 isn't clearly depicted among the options provided.
If you need to identify precise signs for numbers in ASL, it's beneficial to refer to a visual guide or ASL dictionary.