Which of the following examples correctly uses the word similarly?

a. software programmers test their programs on various platforms. similarly, video game makers offer different versions of a game for children and adults.

b. manufacturers test their products by choosing samples from different production batches. similarly, software programmers test their programs on a single platform.

c. drug companies conduct clinical tests by selecting a sample group of participants from different age groups. similarly, other product manufacturers test their products by choosing samples from different production batches.

d. video game makers offer different versions of a game for players in different age groups. similarly, drug companies conduct clinical tests by selecting a group of participants from the targeted age group.