$$The following python code will return

data $=[[\text{'}$Python$\text{'},\text{'}$Programming$\text{'}],[\text{'}$Data$\text{'},\text{'}$Science$\text{'}],[\text{'}$Machine$\text{'},\text{'}$Learning$\text{'}]]$

result $=[\text{'}\text{'}.$join$($item$)$for item in data$]$

print$($result$)$

A: $[\text{'}$Python Programming', 'Data Science', 'Machine Learning'$]$

B: $[\text{'}$Python$\text{'},\text{'}$Programming$\text{'},$ 'Data', 'Science', 'Machine', 'Learning'$]$

C: $[\text{'}$Python$\_$Programming', 'Data$\_$Science', 'Machine$\_$Learning'$]$

D: $[\text{'}$PythonProgramming$\text{'},\text{'}$DataScience$\text{'},$ 'MachineLearning'$]$