The answer is #5.
Homologous chromosomes are a pair of chromosomes, one from each parent. They have the same gene locations. So, if we look at the picture, we sad that chromosome #1 has the following order of sequences:
F, g, h, j
Now, we just need to find which of other chromosomes has the same order of sequences. That is chromosome #5: F, g, h, j
Don't mix it up with chromosomes #2 and #3, their sequences are: F, G, h, j
