The correct answer is D.
When Constitutions were enacted, they included individual rights that would be legally guaranteed for the citizens in the country: freedom of speech, freedom of religion, freedom of assembly, etc.
Voting rights were also granted to citizens by the Constitution, but not universal suffrage. Firstly, many nations implemented census suffrage and, under this system, individuals had to meet certain requirements to be able to vote (for example: minimum income level). Afterwards, male universal suffrage was allowed in many countries, but women were not allowed to vote in most countries until the first decades of the 20th century, and it was in this moment, when Constitutions started to include universal suffrage provisions.