Question

which is a thesis statement? the paragraphs that follow present information about using public transportation to commute to and from work in large cities. public transportations many delays, mechanical failures, and overcrowding make it an unrealistic option for most commuters.

Explanation:

A thesis statement presents a clear argument or position. The first sentence is just a statement of what the paragraphs will present (more of an introduction cue). The second sentence presents a clear stance (public transportation is an unrealistic option) which is what a thesis statement does - it makes a claim that can be debated and supported.

Answer:

"Public transportation's many delays, mechanical failures, and overcrowding make it an unrealistic option for most commuters."