The Reagan Doctrine

a. Allied the United States with Europe and Latin America against the Soviet Union
b. Asserted American interests in countries where the Soviet Union had been active
c. Sponsored cooperation between the Soviet Union and United States
d. Pursued a strict policy of nuclear deterrence

b. Asserted American interests in countries where the Soviet Union had been active

Explanation:

United states followed this doctrine from early 1980s until the end of cold war in 1991.

Under this doctrine , united states extended direct or indirect support to all anti communist movement in countries spread over Asia , Africa and Latin america . It was aimed at overwhelming the cold war in order to bring peace in the world.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.