Select the most appropriate option to fill in blank number 5.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. spreading.
Spreading means to cover or reach a wider or increasing area.
The phrase "contribution to" is always followed by a noun or a gerund (the -ing form of a verb). A gerund acts like a noun in this case, which is why "spreading" is the correct form.
The gerund "spreading" emphasizes the ongoing nature of these positive actions.