The phrase 'just because' is used when you want to say that a particular situation should not necessarily make you come to a particular conclusion.
Filling the blank with 'because' gives the meaning that just for the reason that your goals do not fit into the plans of others, you should not change them. It makes the sentence meaningful.
The situation given in the statement is that your goals might not fit into the plans of others. The conclusion is about not changing the goals. So, 'just because' correctly connects the situation with the conclusion.
'Whereas' and 'however' are used to present the contrast between the two phrases while in this sentence a conclusion is presented with respect to the situation. So, options c) and e) are incorrect.
Filling the blank with 'why' gives no meaning to the sentence. So, option b) is incorrect.
'Rather' is an adverb used to indicate one's preference in a particular matter. A preference is not stated in this sentence. A suggestion has been given. So, option d) is incorrect.
So, 'because' is apt to fill the blank.
Hence, option a) is correct.
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