Is it good time to buy YHOO short term call on Monday?

I am thinking of .YHQEX. The risk/reward ratio is low.

My reasons are:

1) Time factor only 05.-0.6 and in a week's time there are three major events to occur, quarter results for YHOO on 22nd, for MSFT 24th and deadline for YHOO to reply on 26th.

2) There is a price already on YHOO, 31, and YHOO shareholders could choose either 0.9509 share of MSFT or cash. The chance that YHOO share price would drop a large part below the present price is small unless the broad market falls under the March low.

3) Good quarter result either for YHOO or MSFT would definitely push the share prices of YHOO higher and there is a good chance MSFT could follow the GOOG type burst out. As YHOO share price also depends on MSFT share price and would be benefitting from MSFT's rise. The technical chart for MSFT support my supposition.

4) Tech sector is coming back in the last two week and is also helping share price of MSFT.

Any comments?