Read the excerpts from Samuel Johnson's preface to A Dictionary of the English Language,
Many quotations serve no other Thus have I laboured by settling the
purpose, than that of proving the bare orthography, displaying the analogy,
existence of words, and are therefore regulating the structures, and
selected with less scrupulousness ascertaining the signification of
than those which are to teach their English words, to perform all the parts
structures and relations.
of a faithful lexicographer.
In both excerpts, the word structure refers to the
ways a dictionary is assembled.
organization of alphabetical entries.
O components, or parts, of words.
O places, or institutions, that house books.

In both excerpts, the word structure refers to the the components, or parts, of words.

Explanation:

Many quotations serve no other Thus have I laboured by settling the

purpose, than that of proving the bare orthography, displaying the analogy,

existence of words, and are therefore regulating the structures, and

selected with less scrupulousness ascertaining the signification of

than those which are to teach their English words, to perform all the parts

structures and relations. of a faithful lexicographer. In both excerpts, the word structure refers to -  components, or parts, of words.

So we can say that in both excerpts, the word structure refers to the the components, or parts, of words.

b is the answer for this question.

the italian poet francesco petrarch did! (: