Which action did Lonnie Smith take to advance the cause of civil rights for African Americans in Texas?

A. he refused to take a seat in the backs of a city bus

B. he petitioned the governor for the right to attend University of Texas

C. he published articles highlighting racism and the state government

D. he filed a lawsuit challenging the races primary system used by democrats

The correct answer is D. he filed a lawsuit challenging the races primary system used by democrats.

In 1940, he tried to vote but he was denied his right, he filed a lawsuit and since 1944 he was able to vote in the same place where he was once refused.

D. Lonnie Smith filed a challenging lawsuit to primary system of races used by democrats to advance the cause of civil rights for African Americans in Texas.

Explanation:

Lonnie Smith, a dentist by profession, was closely associated with the civil rights movement in Texas and was also a part of the National Association for the Advancement of Colored People. It was he who raised his voice against the all-white primaries in Texas and filed a lawsuit in the Supreme Court.

It was after the Supreme Court passed the judgment in the favor of Lonnie Smith the blacks got the right to vote in Texas.