The term "precision" best refers to which of the following?
a) whether or not a measurement is correct
b) how “close together” a seat of measurements is
c) whether or not a tool for making measurements is useful
d) how close a measurement is to an accepted value for measurement

A.

Explanation:

the term precision refers to something that is has the most quality or good condition, being precise and exact.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.