Which version of the sentence uses correct parallel structure?

a. saving is the key to a comfortable old age, and not saving is to be the key to an anxious one.
b. saving is the key to a comfortable old age, and in not saving is the key to an anxious one.
c. saving is the key to a comfortable old age, and not saving is the key to an anxious one.
d. saving is the key to a comfortable old age, and not to save is the key to an anxious one.

163)nick said to his mom that he will kill himself

164)she said that honey was sweet

165)nick joked that he called it chicken drumsticks

166)mick said that he totally loved the english premier league

167)nick said that she was amazing

168)nick asked if you were going to finish strong

169) socrates asked that what he wanted the most when he was there

170)murthy said to anna that she had passed the exam

171)he said that he wanted to join it

172)he asked if i have seen the accident

173)the doctor requested to take rest for a week

hope this will

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messi

entrepreneur give a lot of money to people so the answer is a

in other words

to put it differently

for one thing

as an illustration

in this case

for this reason

to put it another way

that is to say

with attention to

by all means

important to realize

another key point

first thing to remember

most compelling evidence

must be remembered

point often overlooked

to point out

on the positive side

on the negative side

with this in mind

notably

including

like

to be sure

namely

chiefly

truly

indeed

certainly

surely

markedly

such as

especially

explicitly

specifically

expressly

surprisingly

frequently

significantly

particularly

in fact

in general

in particular

in detail

for example

for instance

to demonstrate

to emphasize

to repeat

to clarify

to explain

to enumerate

answer: inference

explanation:

an inference can be understood as a conclusion to which a person is able to get based on reasoning. it is the same as a deduction, a guess, an assumption.   in the sentence presented, the conjunction "but" gives the readers an idea of contrast, and, therefore, allows them to induce that despite the opponent's characteristics, andrea had something different that made her win.