Which statement describes a common trait of the three reconstruction amendments? they all prevented states from re-establishing a system of slavery. they have all been used to expand voting rights for minority groups. they all focused on extending citizenship and protecting civil rights of minority groups. they were all supported by both republicans and democrats at the time of their passage.

Among the options given on the question the correct answer is option C.

They all focused on extending citizenship and protecting civil rights of minority groups

Explanation: The three Reconstruction Amendments are 13th, 14th and 15th amendments of thee constitution after the Civil war. This reconstruction amendment came after 60 years of the 12th amendment.These amendments are called as the reconstruction amendments because, they were proposed and enacted during the Reconstruction era.

However, the 13th amendment was proposed to abolish slavery and involuntary servitude, except for those duly convicted of a crime. This proposal ratified in Congress in 1865.

The 14th amendment was proposed to  address citizenship rights and equal protection of the laws for all persons and it was ratified in 1868 in Congress.

The 15th amendment was proposed to  prohibit discrimination in voting rights of citizens on the basis of "race, color, or previous condition of servitude."[4] All races, regardless of prior slavery, could vote in some states of the early United States, such as New Jersey, provided that they could meet other requirements, such as property ownership.

Therefore, the common link between these three amendments is to highlight on extending citizenship and protecting civil rights of all citizens along with minority group.

They all focused on extending citizenship and protecting civil rights of minority groups

Explanation:

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering