Final answer:
The question is about different types of manual pipe threaders, which are tools used to create threads on pipes. 'Ratcheting' refers to a mechanism aiding in threading, and a 'die-head' is a component with cutting teeth. Electric and hydraulic options are not considered manual.
Step-by-step explanation:
The types of manual pipe threaders primarily refer to the different mechanisms used to create threads on the end of a pipe, which allow for connections to other pipes or fittings. From the options provided,
A. Ratcheting, Electric
and
C. Die-head, Ratcheting
seem to describe mechanisms or features found in manual pipe threading tools. Ratcheting refers to a mechanism that allows the tool to turn the die head in one direction while permitting motion in the other direction, which eases the manual threading operation. Die-head is the part of the threader that contains the cutting teeth to create the pipe threads. The electric option mentioned is not manual, and hydraulic systems, while used for heavy machinery such as backhoes, are not typically used in manual pipe threading tools.