What term best describes the flow structure that does not allow for multiple branches?

The term that best describes the flow structure that does not allow for multiple branches is "Sequence." In programming and flowcharting, a sequence is the simplest control structure where statements or instructions are executed one after the other in a linear fashion. There are no decisions or repetitions involved—each line of code is executed in order, which makes it straightforward and easy to understand.

In contrast, iteration refers to a repetitive process where a block of code runs multiple times, and selection involves making decisions, leading to different branches in the flow based on certain conditions. Branching is a general concept that implies that there are multiple paths that the flow can take based on conditions met, meaning that these options allow for divergence rather than a straight sequence. Thus, a sequence stands out as the structure where all operations follow a single pathway without any branches.