Nine-tenths (1)/ of the pillar (2)/ have rotted away.(3)/No error (4).

Options

A. 1 Nine-tenths
B. 2 of the pillar
C. 3 have rotted away.
D. 4. No error

Answer

3

Explanation

has will replace have because - with fractions, percentages and indefinite quantifiers (all, few, many, much, some), the Verb agrees with the preceeding Noun/clause. Nine-tenths of the pillar `rarr` Singular Subject So, the Verb will also be Singular The basic structure is as follows:

Hence, has rotted away is the right usage.