How are the lysogenic and lytic cycles different?

a. the lytic cycle is much slower.

b. the lytic cycle causes disease.

c. the lytic cycle is used by dna viruses.

d. the lytic cycle replicates viruses?

Option D, the lytic cycle replicates viruses

Explanation:

Lysogenic cycle spread viral DNA through the prokaryotic reproduction and thus it takes a long time in copying viruses. On the other hand lyctic cycle is an immediate and a fast process  that allows making copies of viruses at a much faster rate than the lysogenic cycle but the cell (host cell) is destroyed.

However in lysogenic cycle the viral genome is introduced into the host cell genome thereby infecting it from inside.

Hence, option D is correct

your answer is "the 1950's"