From the words or group of words lettered A to D, choose the word or group of words that best completes the sentence.
It is I who ......... to blame for the lapses.
was
am
is
are
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The verb "is" is not correct in this context because "I" is a first-person singular pronoun, and the correct verb form to agree with it is "am." In English, when the subject is a singular first-person pronoun like "I," the corresponding verb form is "am," not "is." Therefore, "It is I who am to blame for the lapses" is grammatically correct.

The answer to this is wrong. 'I" is regarded as plural and therefore goes with plural helping verb.
AM is plural verb and so is the correct answer

(It) (is) I (who)___ to blame 4 d lapses,this is parenthesis concord.IT,IS AND WHO are nt really needed in d question.Therefore d answer is AM...and dat is d correct answer.

The selected answer is wrong:
Whenever It is,It was,It seems to be,It appears to be + Noun/Pronoun + who appears in a sentence, the Noun/Pronoun provides the verb.
You can't say "I is to blame for the lapses" you can only say "I am to blame for the lapses". That implies that the answer is B, It is I who am to blame for the lapses.
REF: http://thegrammarexchange.infopop.cc/eve/forums/a/tpc/f/340600179/m/313102154

The selected answer is wrong:
Concord says that whenvever
It is,It was,
It seems to be,It appears to be + N/P + who - the pronoun provides the verb. I.e I am to blame

" It is I who AM to blame for the lapses" is correct. Normally the verb in a relative clause takes the third person. However, the verb can agree with the noun referred to in the main clause when the noun is in the first or second person. In this instance “who” refers to “I”, first person, and therefore “am” is appropriate.

English is governed by rules snd even those rules are not fast and hard (always applicable in all situations)
According to Concord, the last subject to the verb determines the verb so what verb goes with I
I is 
i am

It is I who am to blame not is.for one can't say I is here but rather I am here





