Getting a new governmet in Spain

More than 175 seats are required to secure enough support for a new government in Spain, since congress has 350 seats.
PSOE (Socialist Workers Party of Spain) was the winner in the last elections, but it got 123 seats, so fell short of a majority. The leader of PSOE is the incumbent Prime Minister, Pedro Sánchez.

What to do now?

1st Option: Two parties agreement

Well, the obvious solution is that PSOE and Ciudadanos (a centrist party with 57 seats in Congress) make 180 seats.  Banco Santanter (one of the two biggest banks in Spain) in a report sent to big clients stated that such an agreement would please the markets. But Ciudadanos has sworn not to support PSOE to form a government. But if they form a government, they will be willing to negotiate big deals at state level.

2nd Option: "Frankestein government"

It is weird, but not impossible.
PSOE (123 seats) + Podemos (35 seats) + ERC (15 seats) + Guanyem (7 seats) = 180 seats

-Podemos is a populist left-wing party whose leader, Pablo Iglesias, loves comunism and south american populism.
-ERC (Republican Left of Catalonia) is a nationalist catalonian party which supports indepedence for catalonia and whose leader, Oriol Junqueras (now in jail), is accused rebellion and sedition.
-Guanyem is the sister party of Podemos in Catalonia which supports nationalist parties in a way that does not destroy the country but it weakens Spain.

It is known as "Frankestein government", because this parties have contradictory goals and interests.

3rd option: Operation Unthinkable

It's an idea of CEOE (the organisation that represents the big corporations of Spain).  PP (Popular Party, conservative, with 66 seats) and Ciudadanos abstein from voting, so PSOE, at least, gets a majority of votes even if it does not reach 176 seats. It is hard to believe, because Ciudadanos does not seem to accept that idea and the PP has never done it in the last 40 years. It is not expected to happen.

4th option: New elections

Of course there are more options, but they are not likely.

Explanation: In Spain, anything said about politics by big companies can be used like political ammunition by leftist parties. But big companies may be afraid of an looming world public debt crisis and they need a reliable government ready to tackle problems without revolutions.