The best evidence that we have is the statistics from the Government

Dear chrtpmdr, dear Pranjal3107, dear mukherjeeabhish, dear Divyanshumishra, dear Aruni1991, dear community,

this question got me as well! But I looked into the matter a bit deeper and don't want to keep want I learned to myself!

1. The subject is "The best evidence", which is singular. Evidence is an uncountable noun and is always singular (there is no plural form, but you could say "pieces of evidence"). Therefore, evidence is always followed by a singular verb (as is the case in choices A&B)

(Source: https://www.ldoceonline.com/dictionary/evidence)

2. The verb is a linking verb. I believe that adds to the confusion. We know that linking verbs describe not what a subject does BUT WHAT IT IS or in what condition it is in. The nouns linked by linking verbs are supposed to be similar in the function and meaning. For this reason I thought that nouns being linked both have to be either singular or plural BUT THIS IS FALSE as it turns out:
" Linking verbs such as be, seem, look, and appear are followed by a complement, and a noun complement should not be confused with a subject. Make the verb agree with the subject stated before the linking verb, not with the noun complement that follows the verb."

Other examples:
"Rare books are her passion."
plural subject / plural verb / singular complement
("Rare books" are being linked to "her passion". The subject of the setence is rare books and not "her passion" and therefore the verb takes the plural form of the subject)

"Her passion is rare books."
singular subject / singular verb / plural complement
("Her passion" is being lined to "rare books". The subject of the sentence is "her passion" and not "rare books" and therefore the verbs takes the singular form of the subject)
(Source: https://college.cengage.com/english/rai ... bject4.htm)

If this helped you please give me a kudos