The plural of stimulus is:

The surface area of a laboratory bench measures 12 square feet. What is the surface area in square meters?

A. 1.115 square meters B. 11.15 square meters C. 111.5 square meters D. 1115 square meters

Antiviral drugs should be applied

a. at the first symptom of a cold sore. b. at the end of the itching phase. c. when the ulcers become crusty. d. when the ulcers disappear.