Second and third conditional examples. All choices are grammatically correct. 

Second conditional. We can use the second conditional to talk about imaginary, impossible or unlikely situations in the present or future. 'if' + past tense, 'would(n't)/might/could' + verb

If you let other people talk, you won't be able to speak.

If I invest my money with you, I might lose it all.

If I invested with you, I wouldn't have any money left over.

If you had invested with me, I would have been very happy,

If I invested my money with you, I could lose it all.

If you get it done in time, we'll give you the job.

If you patent the invention, you could make a lot of money from it.

Second conditional. We can use the second conditional to talk about imaginary, impossible or unlikely situations in the present or future.  'would(n't)/might/could' + verb + 'if' + past tense

Your money could grow, if you invest it wisely.

You might get rich, if you start working for me.

Your money would have grown quicker, if you had invested it with me.

Third conditional. We can use the third conditional to imagine the result of something that did not happen. We can use 'if' +  past perfect, would(n't) have + past participle.

 If I could, I would gamble with the money.

If I had gambled, I would have lost all my money.

If I bought that, I wouldn't have any money left.

If I had seen that handbag first, I wouldn't have had the chance to buy this one.

If I see an expensive handbag, I want to buy it.

Third conditional. We can use the third conditional to imagine the result of something that did not happen. We can use 'would(n't) have + past participle + 'if' + past perfect.

I would invest in that product, if I were you.

You wouldn't lose your money, if you invested in that product.

I wouldn't have done that, if I'd been you.