In $PC$ $relative$ $mode$ we have to use the content of the address part of the instruction and the current PC value of the instruction which mean m{PC+ relative address(from operand info)] will give the effective address.So overall only one memory access we performed.
In simple $indirect$ $mode$ of access we perform an indirection to the effective address which means the operand info stores an address which holds the address of the operand(effective address) which unnecessarily increases the no of memory accesses and has no obvious benefit over the absolute mode .In deferred indirect mode we go for multiple levels of indirection.By default indirect means simple indirect mode which needs two memory accesses
Clearly $O1$ requires$ 1$ and $O2$ requires $2$.
Hence correct answer is 3
