Step 1:
Dinkar was a famous Hindi poet and nationalist writer.
Step 2:
His famous writings include:
\[
\text{Rashmirathi and Sanskriti Ke Char Adhyaya}
\]
Step 3:
Saketa was written by Maithili Sharan Gupt, Madhushala by Harivansh Rai Bachchan, and Andhayuga by Dharamvir Bharati.
Step 4:
Hence, the correct answer is:
\[
\boxed{\text{(3) C and D Only}}
\]