How to use 以前 (yǐqián) and 从前 (cónɡqián) in Chinese?

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The correct answer is 

A

. Nǐ zhǔnbèi shénme shíhou jiéhūn? Tina：你    准备     什么     时候    结婚？

When are you going to get married? Sānshí suì yǐqián kěndìng jiéhūn. Kate：三十     岁  以前     肯定      结婚。

I plan to get married before I’m 30 years old.

Explanation:

This …