National Women’s History Month began as a single week and as a local

I was considering between A and B. End up choosing B which I know is wrong. What threw is me off was that I was expecting a Month had began as ... when, in 1978 versus Month began as. At least B clears this up with a single simple past.

I understand that National Women's History began first, followed by Sonoma County sponsoring in 1978. Does the sentence read fine without the past perfect when it seems clear to be that "National Women's History began" and "Sonoma County sponsored" occurred at two different times?

National Women's History Month began as a single week and as a local event when, in 1978, Sonoma County, California, sponsored a women's history week to promote the teaching of women's history - a neglected subject in elementary and high school curricula at that time.

a) began as a single week and as a local event when, in 1978, Sonoma County, California, sponsored
b) began as a single week local event sponsoring, in Sonoma County, California,
c) begins with a single week in 1978 sponsoring the local Sonoma County, California of
d) will have began in 1978 as a single week local event when Sonoma County, California was in sponsorship of
e) was begun in 1978 when, in Sonoma County, California, there was to be a sponsorship

The week-long program was a part of a sponsorship event by the County and hence both were simultaneous justifying the use of began. B's mistake lies in implying that the local wee long event sponsored itself. That is what the phrase 'local event sponsoring' without a comma in between indicates.
There is no need to consider other ridiculously structured choices.

National Women's History Month began as a single week and as a local event when, in 1978, Sonoma County, California, sponsored a women's history week to promote the teaching of women's history—a neglected subject in elementary and high school curricula at that time.

A ○ began as a single week and as a local event when, in 1978, Sonoma County, California, sponsored
B. began as a single week local event sponsoring, in Sonoma County, California,
C. begins with a single week in 1978 sponsoring the local Sonoma County, California of
D. will have began with in 1978 as a single week local event when Sonoma County, California was in sponsorship of
E. was begun in 1978 when, in Sonoma County, California, there was to be a sponsorship of

In B, year is not mentioned. Could you please check if there is a typo.

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