Answer:
The sense of touch.
Explanation:
The word "gritty" refers to something being granular, grainy, which speaks most to the sense of touch. People can't (or shouldn't) eat/taste sand, they can see it but they can't necessarily tell it's gritty from its appearance (since sand is so fine), you can't smell something grainy or sand, and you can't smell sand either, especially not its texture.
To find out whether sand is gritty or not, one has to touch it - therefore, the sentence most appeals to the sense of touch.
Sonnet 60 is a Shakespearean or English sonnet consisting of 3 quatrains and a couplet
The answer to the question stated above is <span>an unknown antecedent.</span>
Weak reference:
when a pronoun refers to an antecedent that has been suggested but not expressed
Indefinite reference:
the use of a pronoun that refers to no particular person or thing and which is not necessary to the meaning and structure of a sentence