On january 1, shemwell co. signed a security agreement giving jones a security interest in a crane shemwell was planning to buy for its business.
in exchange for the security agreement, jones signed a contract to lend shemwell $10,000 on request.
on january 9, shemwell purchased the crane.
on january 15, jones delivered $10,000 to shemwell.
on january 20, jones filed the security agreement with the appropriate public officials.

under the ucc, when did jones's security interest in the crane attach?

a. on january 1, when the security agreement was signed.

b. on january 9, when shemwell purchased the crane for its business.

c. on january 15, when jones delivered $10,000 to shemwell.

d. on january 20, when jones filed the security agreement.