Question

Select the option that best fills in the blank and completes the sentence given below.
Less than an inch of soil may form ........ a century in a desert, whereas almost half an inch of soil can form annually in the humid tropics.

• A. on
• B. between
• C. since
• D. during

Hint:

When referring to a period of time, "on" is often used to describe specific time frames, such as "on a century."

Answer 1

The Correct Option is A

The correct preposition here is "on," which is used when describing a period of time during which an event happens. The sentence should read, "Less than an inch of soil may form on a century in a desert."