Step 1: Know the three sexual events.
Sexual reproduction in fungi follows three ordered steps: fusion of cytoplasm, then fusion of nuclei, then a reduction division.
Step 2: Match item A.
Fusion of protoplasms between two gametes, without immediate nuclear fusion, is called Plasmogamy. The prefix plasmo points to cell fluid, so A pairs with II.
Step 3: Match item B.
Fusion of two nuclei is called Karyogamy, because karyon means nucleus. So B pairs with III.
Step 4: Match item C.
Generation of haploid spores happens through Meiosis, the reduction division that brings the chromosome number back to $n$. So C pairs with I.
Step 5: Assemble the matches.
We get A to II, B to III, and C to I.
Step 6: Pick the matching option.
This exact pattern is given by the second option.
\[ \boxed{\text{A-II, B-III, C-I}} \]