In 1973 mortgage payments represented twenty-one percent of an average thirty-year-old male's income; and forty-four percent in 1984

A. income; and forty-four percent in 1984 - incorrect sentence structure- semicolon+ and incorrectly separates an IC and a phrase here
B. income; in 1984 the figure was forty-four percent
C. income, and in 1984 forty-four percent
D. income, forty-four percent in 1984 was the figure - run- on sentence
E. income that rose to forty-four percent in 1984 - that incorrectly refers to income

I was down to options B and C and ended up choosing option C.
1. In option B, what does 'the figure' refer to? Logically, it seems that it refers to the percentage of average thirty-year-old male's income represented by mortgage payments.
Can you give some examples of such construction?
2. Also, what is the issue with option C?

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Skywalker18

C can't even be considered without a verb.

{Independent clause + [comma] + FANBOYS + Independent clause} is the correct construction.

In C we have {(subject) + (verb) + Prepositions) + [Comma] + FANBOYS (AND) + Preposition+ (subject)} - so we're missing a finite verb.

In 1973 mortgage payments represented twenty-one percent of an average thirty-year-old male's income, and in 1984 forty-four percent

However, in B we have

{independent clause} + [semicolon] + {independent clause}

B. income; in 1984 the figure was forty-four percent
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