Choose a suitable preposition to complete the sentence:
The small plant in your lawn is very sensitive _____ touch.
The preposition ‘to’ has numerous functions based on the different situations or contexts it is used in. One of these is when ‘to’ is added to a verb such as ‘hear’ or ‘listen’ to create an infinitive that functions as a noun in the sentence. In the given sentence the verb ‘touch’ needs to be preceded by ‘to’ to make it an infinitive and thereby highlight the reason for the sensitivity of the plant. Hence option C is correct. On the other hand the other prepositions such as ‘on’, ‘with’ and ‘for’ are not used to form an infinitive. Since in the given sentence, the infinitive acts as a noun that conveys the reason for the sensitivity, ‘to’ has to be used, while others are grammatically unsuitable. Hence options A, B, and D are incorrect.