Who was president when the sixteenth amendment was ratified?

Adoption. On June 16, 1909, President William Howard Taft, in an address to the Sixty-first Congress, proposed a two percent federal income tax on corporations by way of an excise tax and a constitutional amendment to allow the previously enacted income tax.

Explanation:

i hope this help

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

what's the passage bud?