The question asks which innovation most significantly increased mass production in the early automobile industry. Let's analyze each option to determine the correct answer:

1. Steam-powered engines: While steam engines were indeed revolutionary in the transportation and industrial sectors, they were largely replaced by internal combustion engines in automobiles. Steam engines did not directly influence mass production efficiency in the automobile industry.
2. Handcrafted carriages: Before the advent of mass production, vehicles were often handcrafted. This method is labor-intensive and did not cater to mass production due to its time-consuming nature, hence could not significantly impact mass production.
3. Wooden chassis frames: This refers to the early construction of cars. Although common in early automobiles, using wooden frames was not a pioneering solution for mass production since it was early manufacturing technology and did not streamline production.
4. Moving assembly line: This is the process introduced by Henry Ford in 1913 for producing automobiles. It significantly reduced the assembly time per vehicle, drastically increasing production efficiency. Cars moved along a conveyor belt, and workers performed specific tasks, thus standardizing and speeding up the process.

The correct answer is the Moving assembly line, as it was a groundbreaking innovation in mass production techniques, allowing manufacturers to produce more vehicles efficiently and at lower costs.

For deeper understanding:

The moving assembly line revolutionized the industry by reducing the production time of a car from over 12 hours to just about 90 minutes. The concept of specialized and sequential assembly operations allowed for cars to be produced at an unprecedented speed, facilitating wider distribution and affordability in the market.

This technique not only impacted the automobile industry but also influenced production models in various sectors worldwide, becoming a cornerstone of modern manufacturing.