Replace the underlined word with the most appropriate SYNONYM.

For sometime now, we've been toying with the idea of transferring all our business from physical to online sales only.

considering

The correct answer is Option (3) - considering

The most appropriate synonym to replace "toying" is:  considering

Explanation

Considering : implies careful thought and deliberation, which aligns with the context of making a major business decision like shifting entirely to online sales.
Launching : suggests initiating or starting something new. While the company might launch online sales eventually, "toying" suggests they're still in the planning phase.
Showing : is too vague in this context. It doesn't necessarily imply the seriousness of considering a major shift.
Careful : modifies an action, but doesn't replace the verb "toying" itself.