Designed to attract maximum attention, billboard advertisers use cutting-edge, digital billboards without static images and monochrome colors to convey more to passers-by than ever before.
A. Designed to attract maximum attention, billboard advertisers use cutting-edge, digital billboards without static images and monochrome colors to convey more to passers-by than ever before. "Designed to attract maximum attention" incorrectly modifies "billboard advertisers" - it should modify the billboards. Eliminate.
B. Designed as attractive, maximum attention-getting billboards are advertised using cutting-edge, digital billboards without static images and monochrome colors to convey more to passers-by than ever before. The billboards are designed to "attract maximum attention" and not to be "attractive". Unnecessary change in meaning. Eliminate.
C. Designed to attract maximum attention, cutting-edge digital billboards are used by billboard advertisers to convey more to passers-by than ever before, without static images and monochrome colors. Correct answer - above errors are rectified and no new errors are introduced.
D. Designed for maximum attention attraction, cutting-edge digital billboards used by billboard advertisers, without static images and monochrome colors, convey more to passers-by than ever before. "Designed for maximum attention attraction" is very awkwardly worded - "designed to attract maximum attention" is much better. Eliminate.
E. Cutting-edge, digital billboards designed to attract maximum attention without static images and monochrome colors that are used by billboard advertisers to convey more to passers-by than ever before. Sentence fragment. Eliminate.